1.
Jericho, Vermont
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Jericho is a town in Chittenden County, Vermont, United States. The population was 5,009 at the 2010 census and it was named after the ancient city of Jericho. According to the United States Census Bureau, the town has an area of 35.6 square miles, of which 35.4 square miles is land and 0.15 square miles. The town of Jericho has a connection with the town of Underhill. The area has four distinct village areas, jerichos second village, Jericho Center, on Browns Trace Road, is home to several historic buildings, churches, and Jericho Center Country Store, Vermonts oldest continuously running general store. The Jericho Center Village has a green, or Common. Next, half of the Underhill Flats area on Route 15 actually sits in Jericho and this area features the multi-use Mills Riverside Park and two general stores. Underhill Center has two general stores as well as St. Thomas Catholic Church, a postal office. Jericho is home to the Chittenden East Wolverines of the Northern Vermont Youth Football League and one of Vermonts oldest and largest Boy Scout troops, the two towns share the Underhill-Jericho Fire Department. Local schools include Jericho Elementary School or Underhill ID Elementary School, Browns River Middle School teaches grades five through eight. There is one school in Jericho—Mount Mansfield Union High School—which serves students from Jericho, Underhill, Richmond, Huntington, Bolton, Jonesville. Students from Mount Mansfield Union High School are allowed to apply to a school for their junior and senior years. They can apply to either The Center for Technology, Essex, CTE is located in Essex Junction and is part of the larger Essex High School. MMU has 849 students enrolled as of 2016, making it the ninth most enrolled school in Vermont. On November 4,2014, the communities of Bolton, Jericho, Richmond, Underhill ID, as of the census of 2000, there were 5,015 people,1,751 households, and 1,402 families residing in the town. The population density was 141.7 people per square mile, there were 1,774 housing units at an average density of 50.1 per square mile. The racial makeup of the town was 97. 45% White,0. 68% Black or African American,0. 14% Native American,0. 56% Asian,0. 08% Pacific Islander,0. 30% from other races, and 0. 80% from two or more races. Hispanic or Latino of any race were 1. 12% of the population,14. 3% of all households were made up of individuals and 4. 3% had someone living alone who was 65 years of age or older
2.
Americans
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Americans are citizens of the United States of America. The country is home to people of different national origins. As a result, Americans do not equate their nationality with ethnicity, although citizens make up the majority of Americans, non-citizen residents, dual citizens, and expatriates may also claim an American identity. See Names for United States citizens. S, virgin Islands and Northern Mariana Islands in the 20th century. It also includes influences of African-American culture, westward expansion integrated the Creoles and Cajuns of Louisiana and the Hispanos of the Southwest and brought close contact with the culture of Mexico. Large-scale immigration in the late 19th and early 20th centuries from Southern and Eastern Europe introduced a variety of elements, immigration from Asia, Africa, and Latin America has also had impact. A cultural melting pot, or pluralistic salad bowl, describes the way in which generations of Americans have celebrated and exchanged distinctive cultural characteristics, in addition to the United States, Americans and people of American descent can be found internationally. As many as seven million Americans are estimated to be living abroad, the United States of America is a diverse country, racially, and ethnically. Some other race is also an option in the census and other surveys, people of European descent, or White Americans, constitute the majority of the 308 million people living in the United States, with 72. 4% of the population in the 2010 United States Census. They are considered people who trace their ancestry to the peoples of Europe, the Middle East. Of those reporting to be White American,7,487,133 reported to be Multiracial, with largest combination being white, additionally, there are 29,184,290 White Hispanics or Latinos. Non-Hispanic Whites are the majority in 46 states, there are four minority-majority states, California, Texas, New Mexico, and Hawaii. In addition, the District of Columbia has a non-white majority, the state with the highest percentage of non-Hispanic White Americans is Maine. The largest continental ancestral group of Americans are that of Europeans who have origins in any of the peoples of Europe. This includes people via African, North American, Caribbean, Central American or South American and Oceanian nations that have a large European diaspora, the Spanish were the first Europeans to establish a continuous presence in what is now the United States. Martín de Argüelles born 1566, San Agustín, La Florida, was the first person of European descent born in what is now the United States. Twenty-one years later, Virginia Dare born 1587 Roanoke Island in present-day North Carolina, was the first child born in the Thirteen Colonies to English parents. 8% of the total population, Hispanic or Latino Americans constitute the largest ethnic minority in the United States. They form the second largest group after non-Hispanic Whites in the United States, hispanic/Latino Americans are very racially diverse, and as a result form an ethnic category, rather than a race
3.
Photography
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Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. With an electronic sensor, this produces an electrical charge at each pixel. A negative image on film is used to photographically create a positive image on a paper base, known as a print. The word photography was created from the Greek roots φωτός, genitive of φῶς, light and γραφή representation by means of lines or drawing, several people may have coined the same new term from these roots independently. Johann von Maedler, a Berlin astronomer, is credited in a 1932 German history of photography as having used it in an article published on 25 February 1839 in the German newspaper Vossische Zeitung. Both of these claims are now widely reported but apparently neither has ever been confirmed as beyond reasonable doubt. Credit has traditionally given to Sir John Herschel both for coining the word and for introducing it to the public. Photography is the result of combining several technical discoveries, later Greek mathematicians Aristotle and Euclid also independently described a pinhole camera in the 5th and 4th centuries BCE. Daniele Barbaro described a diaphragm in 1566, wilhelm Homberg described how light darkened some chemicals in 1694. The fiction book Giphantie, published in 1760, by French author Tiphaigne de la Roche, the discovery of the camera obscura that provides an image of a scene dates back to ancient China. Leonardo da Vinci mentions natural camera obscura that are formed by dark caves on the edge of a sunlit valley, a hole in the cave wall will act as a pinhole camera and project a laterally reversed, upside down image on a piece of paper. So the birth of photography was primarily concerned with inventing means to capture, renaissance painters used the camera obscura which, in fact, gives the optical rendering in color that dominates Western Art. The camera obscura literally means dark chamber in Latin and it is a box with a hole in it which allows light to go through and create an image onto the piece of paper. Around the year 1800, British inventor Thomas Wedgwood made the first known attempt to capture the image in a camera obscura by means of a light-sensitive substance and he used paper or white leather treated with silver nitrate. The shadow images eventually darkened all over, the first permanent photoetching was an image produced in 1822 by the French inventor Nicéphore Niépce, but it was destroyed in a later attempt to make prints from it. Niépce was successful again in 1825, in 1826 or 1827, he made the View from the Window at Le Gras, the earliest surviving photograph from nature. Because Niépces camera photographs required a long exposure, he sought to greatly improve his bitumen process or replace it with one that was more practical. With an eye to eventual commercial exploitation, the partners opted for total secrecy, Daguerres efforts culminated in what would later be named the daguerreotype process
4.
Snowflake
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A snowflake is either a single ice crystal or an aggregation of ice crystals which falls through the Earths atmosphere as snow. Each flake nucleates around a dust particle in supersaturated air masses by attracting supercooled water droplets. The main constituent shapes for ice crystals, from which combinations may occur, are needle, column, plate, Snowflakes appear white in color despite being made of clear ice. This is due to reflection of the whole spectrum of light by the small crystal facets. Once snowflakes land and accumulate, they undergo metamorphosis with changes in temperature, the characteristics of the snowpack reflect the changed nature of the constituent snow crystals. Snowflakes nucleate around mineral or organic particles in moisture-saturated, subfreezing air masses and they grow by net accretion to the incipient crystals in hexagonal formations. The cohesive forces are primarily electrostatic, in warmer clouds an aerosol particle or ice nucleus must be present in the droplet to act as a nucleus. The particles that make ice nuclei are very rare compared to nuclei upon which liquid droplets form, however. Clays, desert dust and biological particles may be effective, although to what extent is unclear, artificial nuclei include particles of silver iodide and dry ice, and these are used to stimulate precipitation in cloud seeding. Experiments show that homogeneous nucleation of cloud droplets only occurs at lower than −35 °C. Once a droplet has frozen, it grows in the supersaturated environment, the droplet then grows by deposition of water molecules in the air onto the ice crystal surface where they are collected. This process is known as the Wegener–Bergeron–Findeisen process, the corresponding depletion of water vapor causes the droplets to evaporate, meaning that the ice crystals grow at the droplets expense. These large crystals are an efficient source of precipitation, since they fall through the due to their mass. These aggregates are usually the type of ice particle that falls to the ground, guinness World Records list the worlds largest snowflakes as those of January 1887 at Fort Keogh, Montana, allegedly one measured 15 inches wide. Although this report by a farmer is doubtful, aggregates of three or four inches width have been observed, single crystals the size of a dime have been observed. Snowflakes encapsulated in rime form balls known as graupel, the exact details of the sticking mechanism remain controversial. Possibilities include mechanical interlocking, sintering, electrostatic attraction as well as the existence of a sticky layer on the crystal surface. The individual ice crystals often have hexagonal symmetry, the shape of the snowflake is determined broadly by the temperature and humidity at which it is formed
5.
Sublimation (chemistry)
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Sublimation is the phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is a process that occurs at temperatures and pressures below a substances triple point in its phase diagram. The reverse process of sublimation is deposition or desublimation, in which a substance directly from a gas to a solid phase. Sublimation has also used as a generic term to describe a solid-to-gas transition followed by a gas-to-solid transition. At normal pressures, most chemical compounds and elements possess three different states at different temperatures, in these cases, the transition from the solid to the gaseous state requires an intermediate liquid state. The pressure referred to is the pressure of the substance. So, all solids that possess an appreciable vapor pressure at a temperature usually can sublimate in air. The term sublimation refers to a change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. For example, the dissociation on heating of ammonium chloride into hydrogen chloride and ammonia is not sublimation. Similarly the combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation, sublimation requires additional energy and is an endothermic change. The enthalpy of sublimation can be calculated by adding the enthalpy of fusion, solid carbon dioxide sublimes everywhere along the line below the triple point, whereas its melting into liquid CO2 can occur only along the line at pressures and temperatures above the triple point. Snow and ice sublime, although more slowly, at temperatures below the freezing/melting point temperature line at 0 °C for most pressures, in freeze-drying, the material to be dehydrated is frozen and its water is allowed to sublime under reduced pressure or vacuum. The loss of snow from a snowfield during a spell is often caused by sunshine acting directly on the upper layers of the snow. Ablation is a process that includes sublimation and erosive wear of glacier ice, naphthalene, an organic compound commonly found in pesticide such as mothball also sublimes. It sublimes easily because it is made of molecules and has van der Waals intermolecular forces. Naphthalene is a solid that sublimes at atmospheric temperature with the sublimation point at around 80˚C or 176˚F. At low temperature, its pressure is high enough,1 mmHg at 53˚C. On the cool surface, the sublimated vapour will be solidified to form a needle-like crystal, iodine produces fumes on gentle heating
6.
Kenneth G. Libbrecht
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Kenneth Libbrecht is a professor of physics and department chairman at the California Institute of Technology. Libbrecht received a B. S. in physics at Caltech in 1980 and he was originally trained as a solar astronomer, studying under Robert Dicke at Princeton University and received his Ph. D. in 1984. However, much of his recent research has focused on the properties of ice crystals, Libbrecht won the 2004 National Outdoor Book Award for The Snowflake, Winters Secret Beauty
7.
Buffalo Museum of Science
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The Buffalo Museum of Science is a science museum located at Martin Luther King Jr. Park in Buffalo, New York, United States, northeast of the downtown district, near the Kensington Expressway. The historic building was designed by August Esenwein and James A. Johnson, the attractions include exhibits showcasing animals, astronomy, the science of technology, and additional science topics. Explorations is a gallery for children ages two to seven featuring new themes every month. Explore You is a systems science studio. The space was remodeled and opened in March 2012, the Rethink Extinct Science Studio opened in March 2015 as remodel of the previous Extinction Gallery. This exhibit focuses on all aspects of extinction throughout the history of life on this planet including present-day extinctions and endangered plants, the Extinction Gallery was a collection of fossils and cultural pieces relating to organisms that have gone extinct on the planet. Many of the pieces in this space come from the previous Dinosaurs and our Place is Space features an astronomy gallery with five different themed areas. Areas include the subjects of the planets and constellations, meteorites, a look at earth from space. Nano is an exhibition that engages family audiences in nanoscale science, engineering. Hands-on exhibits present the basics of nanoscience and engineering, introduce some real world applications, additional exhibitions include the Artifacts Science Studio, the In Motion Science Studio, the Our Marvelous Earth Science Studio, and the Bug Works Science Studio. Whem Ankh was an exhibit displaying artifacts from the life as lived on the banks of the lower Nile River 2,200 years ago. Over 250 artifacts are included in the collection, including the mummies of Nes-hor and of Nes-min, priests in the temple of the Egyptian fertility god Min, and the coffin of Djed-hor-ef-ankh. Whem Ankh closed in July 2013 to make way for construction of the Culture Science Studio which was set to open in April 2014, the Marchand Hall of Wildflowers displayed numerous wax models of species of plant life created throughout several decades by naturalists George and Paul Marchand. The museum also features the National Geographic 3D Cinema, Elements Cafe, the Buffalo Museum of Science homepage
8.
Micrograph
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A micrograph or photomicrograph is a photograph or digital image taken through a microscope or similar device to show a magnified image of an item. This is opposed to an image, which is at a scale that is visible to the naked eye. Micrography is the practice or art of using microscopes to make photographs, a micrograph contains extensive details that form the features of a microstructure. The neuropathologist Solomon C. Fuller designed and created the first photomicrograph in 1900, micrographs are widely used in all fields of microscopy. A light micrograph or photomicrograph is a micrograph prepared using an optical microscope, at a basic level, photomicroscopy may be performed simply by hooking up a regular camera to a microscope, thereby enabling the user to take photographs at reasonably high magnification. Roman Vishniac was a pioneer in the field of photomicroscopy, specializing in the photography of living creatures in full motion and he also made major developments in light-interruption photography and color photomicroscopy. An electron micrograph is a micrograph prepared using an electron microscope, however, the term electron micrograph is not used in electron microscopy. Digital micrography is a digital picture obtained either directly with a microscope or by scanning of a photomicrograph, digital micrographs are now commonly obtained using a USB microscope attached directly to a home computer or laptop. Today, an add-on three-in-one macro lens which has capability to take wide-angle, fish-eye and macro with 7x, 14x, micrographs usually have micron bars, or magnification ratios, or both. Magnification is a ratio between size of object on a picture and its real size, unfortunately, magnification is somewhat a misleading parameter. It depends on a size of a printed picture. Editors of journals and magazines routinely resize a figure to fit the page, a scale bar, or micron bar, is a bar of known length displayed on a picture. The bar can be used for measurements on a picture, when a picture is resized a bar is also resized. If a picture has a bar, the magnification can be easily calculated, ideally, all pictures destined for publication/presentation should be supplied with a scale bar, the magnification ratio is optional. All but one of the micrographs presented on this page do not have a bar, supplied magnification ratios are likely incorrect. The microscope has been used for scientific discovery. It has also linked to the arts since its invention in the 17th century. At first scientists used the microscope to view and draw objects not visible with the unaided eye, early adopters of the microscope, such as Robert Hooke and Antonie van Leeuwenhoek, were excellent illustrators
9.
Snow
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Snowstorms organize and develop by feeding on sources of atmospheric moisture and cold air. Snowflakes nucleate around particles in the atmosphere by attracting supercooled water droplets, snowflakes take on a variety of shapes, basic among these are platelets, needles, columns and rime. As snow accumulates into a snowpack, it may blow into drifts, over time, accumulated snow metamorphoses, by sintering, sublimation and freeze-thaw. Where the climate is cold enough for year-to-year accumulation, a glacier may form, otherwise, snow typically melts seasonally, causing runoff into streams and rivers and recharging groundwater. Major snow-prone areas include the regions, the upper half of the Northern Hemisphere and mountainous regions worldwide with sufficient moisture. In the Southern Hemisphere, snow is confined primarily to mountainous areas, Snow affects ecosystems, as well, by providing an insulating layer during winter under which plants and animals are able to survive the cold. Snow develops in clouds that themselves are part of a weather system. The physics of snow crystal development in clouds results from a set of variables that include moisture content. The resulting shapes of the falling and fallen crystals can be classified into a number of shapes and combinations. Occasionally, some plate-like, dendritic and stellar-shaped snowflakes can form under clear sky with a cold temperature inversion present. Two additional and locally productive sources of snow are lake-effect storms and elevation effects, miid-latitude cyclones are low pressure areas which are capable of producing anything from cloudiness and mild snow storms to heavy blizzards. During a hemispheres fall, winter, and spring, the atmosphere over continents can be cold enough through the depth of the troposphere to cause snowfall, in the Northern Hemisphere, the northern side of the low pressure area produces the most snow. For the southern mid-latitudes, the side of a cyclone that produces the most snow is the southern side, a cold front, the leading edge of a cooler mass of air, can produce frontal snowsqualls—an intense frontal convective line, when temperature is near freezing at the surface. The strong convection that develops has enough moisture to produce whiteout conditions at places which line passes over as the wind causes intense blowing snow. This type of snowsquall generally lasts less than 30 minutes at any point along its path, in cases where there is a large amount of vertical growth and mixing the squall may develop embedded cumulonimbus clouds resulting in lightning and thunder which is dubbed thundersnow. A warm front can produce snow for a period, as warm, moist air overrides below-freezing air, often, snow transitions to rain in the warm sector behind the front. The same effect occurs over bodies of salt water, when it is termed ocean-effect or bay-effect snow. The effect is enhanced when the air mass is uplifted by the orographic influence of higher elevations on the downwind shores
10.
Crystal
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A crystal or crystalline solid is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, the scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification, the word crystal derives from the Ancient Greek word κρύσταλλος, meaning both ice and rock crystal, from κρύος, icy cold, frost. Examples of large crystals include snowflakes, diamonds, and table salt, most inorganic solids are not crystals but polycrystals, i. e. many microscopic crystals fused together into a single solid. Examples of polycrystals include most metals, rocks, ceramics, a third category of solids is amorphous solids, where the atoms have no periodic structure whatsoever. Examples of amorphous solids include glass, wax, and many plastics, Crystals are often used in pseudoscientific practices such as crystal therapy, and, along with gemstones, are sometimes associated with spellwork in Wiccan beliefs and related religious movements. The scientific definition of a crystal is based on the arrangement of atoms inside it. A crystal is a solid where the form a periodic arrangement. For example, when liquid water starts freezing, the change begins with small ice crystals that grow until they fuse. Most macroscopic inorganic solids are polycrystalline, including almost all metals, ceramics, ice, rocks, solids that are neither crystalline nor polycrystalline, such as glass, are called amorphous solids, also called glassy, vitreous, or noncrystalline. These have no periodic order, even microscopically, there are distinct differences between crystalline solids and amorphous solids, most notably, the process of forming a glass does not release the latent heat of fusion, but forming a crystal does. A crystal structure is characterized by its cell, a small imaginary box containing one or more atoms in a specific spatial arrangement. The unit cells are stacked in three-dimensional space to form the crystal, the symmetry of a crystal is constrained by the requirement that the unit cells stack perfectly with no gaps. There are 219 possible crystal symmetries, called space groups. These are grouped into 7 crystal systems, such as cubic crystal system or hexagonal crystal system, Crystals are commonly recognized by their shape, consisting of flat faces with sharp angles. Euhedral crystals are those with obvious, well-formed flat faces, anhedral crystals do not, usually because the crystal is one grain in a polycrystalline solid. The flat faces of a crystal are oriented in a specific way relative to the underlying atomic arrangement of the crystal. This occurs because some surface orientations are more stable than others, as a crystal grows, new atoms attach easily to the rougher and less stable parts of the surface, but less easily to the flat, stable surfaces
11.
Adolescence
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Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood. Adolescence is usually associated with the years, but its physical, psychological or cultural expressions may begin earlier. For example, puberty now typically begins during preadolescence, particularly in females, physical growth, and cognitive development can extend into the early twenties. Thus age provides only a marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence. A thorough understanding of adolescence in society depends on information from various perspectives, including psychology, biology, history, sociology, education, and anthropology. Within all of these perspectives, adolescence is viewed as a period between childhood and adulthood, whose cultural purpose is the preparation of children for adult roles. It is a period of transitions involving education, training, employment and unemployment. The end of adolescence and the beginning of adulthood varies by country, Adolescence is usually accompanied by an increased independence allowed by the parents or legal guardians, including less supervision as compared to preadolescence. Major pubertal and biological changes include changes to the sex organs, height, weight, cognitive advances encompass both increment in knowledge and in the ability to think abstractly and to reason more effectively. The study of adolescent development often involves interdisciplinary collaborations, for example, researchers in neuroscience or bio-behavioral health might focus on pubertal changes in brain structure and its effects on cognition or social relations. Sociologists interested in adolescence might focus on the acquisition of social roles, developmental psychologists might focus on changes in relations with parents and peers as a function of school structure and pubertal status. Some scientists have questioned the universality of adolescence as a developmental phase, puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity. The average age of onset of puberty is at 11 for girls and 12 for boys, every persons individual timetable for puberty is influenced primarily by heredity, although environmental factors, such as diet and exercise, also exert some influences. These factors can contribute to precocious and delayed puberty. Some of the most significant parts of pubertal development involve distinctive physiological changes in height, weight, body composition. These changes are largely influenced by hormonal activity, puberty occurs through a long process and begins with a surge in hormone production, which in turn causes a number of physical changes. It is the stage of life characterized by the appearance and development of sex characteristics. This is triggered by the pituitary gland, which secretes a surge of hormonal agents into the blood stream, initiating a chain reaction to occur
12.
Microscope
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A microscope is an instrument used to see objects that are too small for the naked eye. The science of investigating small objects using such an instrument is called microscopy, microscopic means invisible to the eye unless aided by a microscope. There are many types of microscopes, the most common is the optical microscope, which uses light to image the sample. Other major types of microscopes are the microscope, the ultramicroscope. The earliest microscopes were single lens magnifying glasses with limited magnification which date at least as far back as the wide use of lenses in eyeglasses in the 13th century. Compound microscopes, which combine an objective lens with an eyepiece to view a real image, the actual inventor of the compound microscope is unknown although many claims have been made over the years. These include what may be a claim by the son of Zacharias Janssen that his father invented the microscope and telescope as early as 1590. Historians note the compound microscope did not appear in the Netherlands until the 1620s, giovanni Faber coined the name microscope for the compound microscope Galileo submitted to the Accademia dei Lincei in 1625. The first detailed account of the construction of living tissue based on the use of a microscope did not appear until 1644, in Giambattista Odiernas Locchio della mosca. It was not until the 1660s and 1670s that the microscope was used extensively for research in Italy, marcello Malpighi in Italy began the analysis of biological structures, beginning with the lungs. Robert Hookes Micrographia had an impact, largely because of its impressive illustrations. A significant contribution came from Antonie van Leeuwenhoek who achieved up to 300 times magnification using a single lens microscope. He sandwiched a very small glass ball lens between the holes in two metal plates riveted together, and with a needle attached to mount the specimen. Then, Van Leeuwenhoek re-discovered red blood cells and spermatozoa, on 9 October 1676, he reported the discovery of micro-organisms. The performance of light microscopy depends as much on how the sample is illuminated as on how it is observed, early instruments were limited until this principle was fully appreciated and developed, and until electric lamps were available as light sources. In 1893 August Köhler developed a key principle of sample illumination, Köhler illumination and this method of sample illumination produces even lighting and overcomes the limited contrast and resolution imposed by early techniques of sample illumination. In the early 20th century a significant alternative to light microscopy was developed, ernst Ruska started development of the first electron microscope in 1931 which was the transmission electron microscope. The transmission electron microscope works on the principle as an optical microscope but uses electrons in the place of light
13.
View camera
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The view camera is a large format camera in which the lens forms an inverted image on a ground glass screen directly at the plane of the film. The image viewed is exactly the same as the image on the film and this type of camera was first developed in the era of the daguerreotype and still in use today, though with many refinements. It comprises a flexible bellows that forms a seal between two adjustable standards, one of which holds a lens, and the other a viewfinder or a photographic film holder. There are three types, the monorail camera, the field camera, and press or technical cameras. The bellows is a flexible, accordion-pleated box and it encloses the space between the lens and film, and flexes to accommodate the movements of the standards. The front standard is a board at the front of the camera that holds the lens and, usually, the front and rear standards can move in various ways relative to each other, unlike most other camera types. This provides control over focus, depth of field, and perspective, the camera is usually used on a tripod or other support. Several types of cameras are used for different purposes, and provide different degrees of movement. They include, Monorail camera - This is the most common type of view camera, with front. This design gives the greatest range of movements and flexibility, with front and rear standards able to tilt, shift, rise, fall, and swing in similar proportion. These are generally made of metal with leather or synthetic bellows, Sinar and Toyo are popular manufacturers of monorail view camera systems. ARCA-Swiss produces monorail cameras for use in addition to models for the more conventional studio applications. Many manufacturers also offer monorail extensions that move the front or rear standards farther away from each other to facilitate focusing on close objects. Field camera - These have the front and rear mounted on sliding rails fixed to a hinged flat bed that can be attached to a camera support. These cameras are made of wood, or sometimes lightweight. With the bellows fully retracted, the flat bed folds up, reducing the camera to a small, light. The trade off for this portability is that the standards are not as mobile or as adjustable as on a monorail design, the rear standard in particular may be fixed and offer no movement. These large format but transportable cameras are popular with landscape photographers, tachihara and Wisner are examples of modern field cameras at opposite ends of the price scale
14.
Blackboard
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A blackboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone, a blackboard can simply be a piece of board painted with matte dark paint. Black plastic sign material, using the trade name sintra is also used to create custom chalkboard art, a more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade blackboards are made of a rougher version porcelain enamelled steel, porcelain is very hard wearing and blackboards made of porcelain usually last 10–20 years in intensive use. Manufacturing of slate blackboards began by the 1840s, green chalkboards, generally made of porcelain enamel on a steel base, first appeared in the 1960s. Lecture theatres may contain a number of blackboards in a grid arrangement, the lecturer then moves boards into reach for writing and then moves them out of reach, allowing a large amount of material to be shown simultaneously. The chalk marks can be wiped off with a damp cloth. However, chalk marks made on some types of wet blackboard can be difficult to remove, sticks of processed chalk are produced especially for use with blackboards in white and also in various colours. These are often not from chalk rock but from calcium sulfate in its dihydrate form. Chalk sticks containing calcium carbonate typically contain 40-60% of CaCO3, as compared to whiteboards, blackboards have a variety of advantages, Chalk requires no special care, whiteboard markers must be capped or else they dry out. Chalk is an order of magnitude cheaper than whiteboard markers for a amount of writing. It is easier to draw lines of different weights and thicknesses with chalk than with whiteboard markers, dashed lines can be drawn very quickly using a technique involving the friction of the chalk and blackboard. Chalk has a smell, whereas whiteboard markers often have a pungent odor. Chalk writing often provides better contrast than whiteboard markers, Chalk can be easily erased, writing which has been left on a whiteboard for a prolonged period may require a solvent to remove. Chalk can be removed from most clothing, whiteboard markers often permanently stain fabric. On the other hand, chalk produces dust, the amount depending on the quality of chalk used, the dust also precludes the use of chalk in areas shared with dust-sensitive equipment such as computers. The writing on chalkboards is difficult to read in the dark, Chalk sticks are notorious for shrinking through use, and breaking in half unless inserted in a writing utensil designed to store chalk. According to a run by Michael Oehler, a professor at the University of Media and Communication in Cologne, Germany
15.
Microscope slide
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A microscope slide is a thin flat piece of glass, typically 75 by 26 mm and about 1 mm thick, used to hold objects for examination under a microscope. Typically the object is placed or secured on the slide, and this arrangement allows several slide-mounted objects to be quickly inserted and removed from the microscope, labeled, transported, and stored in appropriate slide cases or folders. Microscope slides are used together with a cover slip or cover glass. These sliders were popular in Victorian England until the Royal Microscopical Society introduced the standardized glass microscope slide, a standard microscope slide measures about 75 mm by 25 mm and is about 1 mm thick. A range of sizes are available for various special purposes, such as 75 x 50 mm and for geological use,46 x 27 mm for petrographic studies. Slides are usually made of glass and their edges are often finely ground or polished. Microscope slides are made of optical quality glass, such as soda lime glass or borosilicate glass. Fused quartz slides are used when ultraviolet transparency is important. While plain slides are the most common, there are specialized types. A concavity slide or cavity slide has one or more shallow depressions, designed to hold slightly thicker objects, if this system were used with a slide which did not incorporate these cut-off corners, the corners would chip and the slide could shatter. A graticule slide is marked with a grid of lines that allows the size of objects seen under magnification to be easily estimated, sometimes one square of the grid will itself be subdivided into a finer grid. Slides for specialized applications, such as counting, may have various reservoirs, channels. Various permanent markings or masks may be printed, sand-blasted, or deposited on the surface by the manufacturer, some slides have a frosted or enamel-coated area at one end, for labeling with a pencil or pen. Slides may have special coatings applied by the manufacturer, e. g. for chemical inertness or enhanced cell adhesion, the coating may have a permanent electric charge to hold thin or powdery samples. Common coatings include poly-L-lysine, silanes, epoxy resins, or even gold, the mounting of specimens on microscope slides is often critical for successful viewing. The problem has given much attention in the last two centuries and is a well-developed area with many specialized and sometimes quite sophisticated techniques. In a dry mount, the simplest kind of mounting, the object is placed on the slide. A cover slip may be placed on top to protect the specimen and this mounting can be successfully used for viewing specimens like pollen, feathers, hairs, etc
16.
Temperature
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A temperature is an objective comparative measurement of hot or cold. It is measured by a thermometer, several scales and units exist for measuring temperature, the most common being Celsius, Fahrenheit, and, especially in science, Kelvin. Absolute zero is denoted as 0 K on the Kelvin scale, −273.15 °C on the Celsius scale, the kinetic theory offers a valuable but limited account of the behavior of the materials of macroscopic bodies, especially of fluids. Temperature is important in all fields of science including physics, geology, chemistry, atmospheric sciences, medicine. The Celsius scale is used for temperature measurements in most of the world. Because of the 100 degree interval, it is called a centigrade scale.15, the United States commonly uses the Fahrenheit scale, on which water freezes at 32°F and boils at 212°F at sea-level atmospheric pressure. Many scientific measurements use the Kelvin temperature scale, named in honor of the Scottish physicist who first defined it and it is a thermodynamic or absolute temperature scale. Its zero point, 0K, is defined to coincide with the coldest physically-possible temperature and its degrees are defined through thermodynamics. The temperature of zero occurs at 0K = −273. 15°C. For historical reasons, the triple point temperature of water is fixed at 273.16 units of the measurement increment, Temperature is one of the principal quantities in the study of thermodynamics. There is a variety of kinds of temperature scale and it may be convenient to classify them as empirically and theoretically based. Empirical temperature scales are historically older, while theoretically based scales arose in the middle of the nineteenth century, empirically based temperature scales rely directly on measurements of simple physical properties of materials. For example, the length of a column of mercury, confined in a capillary tube, is dependent largely on temperature. Such scales are only within convenient ranges of temperature. For example, above the point of mercury, a mercury-in-glass thermometer is impracticable. A material is of no use as a thermometer near one of its phase-change temperatures, in spite of these restrictions, most generally used practical thermometers are of the empirically based kind. Especially, it was used for calorimetry, which contributed greatly to the discovery of thermodynamics, nevertheless, empirical thermometry has serious drawbacks when judged as a basis for theoretical physics. Theoretically based temperature scales are based directly on theoretical arguments, especially those of thermodynamics, kinetic theory and they rely on theoretical properties of idealized devices and materials
17.
Ephemerality
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Ephemerality is the concept of things being transitory, existing only briefly. Because different people may value the passage of time differently, the concept of ephemerality is a relative one, an ephemeral waterbody is a wetland, spring, stream, river, pond or lake that only exists for a short period following precipitation or snowmelt. They are not the same as intermittent or seasonal waterbodies, which exist for longer periods, examples of ephemeral streams are the Luni river in Rajasthan, India, Ugab River in Southern Africa, and a number of small ephemeral watercourses that drain Talak in northern Niger. Other notable ephemeral rivers include the Todd River and Sandover River in Central Australia as well as the Son River, Batha River, any endorheic basin, or closed basin, that contains a playa or dry lake at its drainage lowpoint can become an ephemeral lake. Examples include Lake Carnegie in Western Australia, Lake Cowal in New South Wales, Mystic Lake and Rogers Lake in California, even the driest and lowest place in North America, Death Valley, became flooded with a short-lived ephemeral lake in the spring of 2005. There are also ephemeral islands such as Banua Wuhu and Home Reef and these islands appear when volcanic activity increases their height above sea level, but disappear over several years due to wave erosion. Bassas da India, on the hand, is a near-sea level island that appears only at low tide. Many plants are adapted to a lifestyle, in which they spend most of the year or longer as seeds before conditions are right for a brief period of growth. The spring ephemeral plant mouse-ear cress is a well-known example, animals can be ephemeral, with brine shrimp and the mayfly being examples. The placenta is considered an ephemeral organ present during gestation and pregnancy, ephemeral can also be used as an adjective to refer to a fast-deteriorating importance or temporary nature of an object to a person. Brands are notoriously ephemeral assets, and magazine publishing was once much more ephemeral than it is today, a number of art forms can be considered ephemeral because of their temporary nature. Early land art and all sand sculptures, ice sculptures and chalk drawings on footpaths are examples of ephemeral art, G. Augustine Lynas and Duthain Dealbh create ephemeral sculptures. Ephemeroptera Christine Buci-Glucksmann, Esthetique De Lephemere, Galilee, ISBN 2-7186-0622-3
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George Henry Perkins
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George Henry Perkins was a United States naturalist. He was the state entomologist and geologist for Vermont and he was educated at the Knox Academy, Galesburg, Illinois, and at Yale, where he graduated in 1867, and in 1869 received the degree of Ph. D. there for postgraduate studies. In 1869 he was appointed as professor of history in the University of Vermont. Beginning in 1880, he held the office of state entomologist of Vermont, in 1895, he left that post to become the state geologist. He has also lectured on history with success in various places. Thurston, H. T. Colby, F. M. eds and this article incorporates text from a publication now in the public domain, Wilson, James Grant, Fiske, John, eds
19.
Natural history
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Natural history is the research and study of organisms including animals, fungi and plants in their environment, leaning more towards observational than experimental methods of study. It encompasses scientific research but is not limited to it, with articles nowadays more often published in magazines than in academic journals. Grouped among the sciences, natural history is the systematic study of any category of natural objects or organisms. That is a broad designation in a world filled with many narrowly focused disciplines. For example, geobiology has a strong multi-disciplinary nature combining scientists, a person who studies natural history is known as a naturalist or natural historian. The English term natural history is a translation of the Latin historia naturalis and its meaning has narrowed progressively with time, while the meaning of the related term nature has widened. In antiquity, it covered essentially anything connected with nature or which used materials drawn from nature. For example, Pliny the Elders encyclopedia of this title, published circa 77 to 79 AD, covers astronomy, geography, man and his technology, medicine and superstition as well as animals and plants. Medieval European academics considered knowledge to have two divisions, the humanities and divinity, with science studied largely through texts rather than observation or experiment. In modern terms, natural philosophy roughly corresponded to modern physics and chemistry, natural history had been encouraged by practical motives, such as Linnaeus aspiration to improve the economic condition of Sweden. Similarly, the Industrial Revolution prompted the development of geology to help find useful mineral deposits, the astronomer, William Herschel was also a natural historian. Instead of working with plants or minerals he worked with the stars and he spent his time building telescopes to see the stars and the rest of the time watching the stars. In the beginning, he believed there to be a known as a nebulae. Herschel can be considered a natural historian because he observed the natural world, in the process he made charts of all the stars and kept records of all that he saw. S. Wilcove and T. Eisner, The close observation of organisms—their origins, their evolution, their behavior and it encompasses changes in internal states insofar as they pertain to what organisms do. Some definitions go further, focusing on observation of organisms in their environment. Bartholomew, A student of history, or a naturalist, studies the world by observing plants. A common thread in many definitions of natural history is the inclusion of a component, as seen in a recent definition by H. W. Greene
20.
University of Vermont
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The University of Vermont, officially The University of Vermont and State Agricultural College, is a public research university and, since 1862, the U. S. state of Vermonts sole land-grant university. Founded in 1791, UVM is among the oldest universities in the United States and is the institution of higher education established in the New England region of the U. S. northeast. It is also listed as one of the original eight Public Ivy institutions in the United States, the university is incorporated in the city of Burlington–Vermonts most populous municipality. The campus Dudley H. Davis Center was the first student center in the country to receive a Leadership in Energy and Environmental Design Gold certification. The largest hospital complex in Vermont, the University of Vermont Medical Center, has its facility on the UVM campus and is affiliated with the Robert Larner College of Medicine. The University of Vermont was founded as a university in 1791. The university enrolled its first students 10 years later and its first president, the Rev. Daniel C. Sanders, was hired in 1800, and served as the faculty member for seven years. Instruction began in 1801, and the first class graduated in 1804, in 1865, the university merged with Vermont Agricultural College, emerging as the University of Vermont and State Agricultural College. Much of the funding and planning for the university was undertaken by Ira Allen. Allen donated a 50-acre parcel of land for the universitys establishment, most of this land has been maintained as the universitys main green, upon which stands a statue of Allen. The citizens of Burlington helped fund the universitys first edifice, and and this building came to be known as Old Mill for its resemblance to New England mills of the time. The Marquis de Lafayette, a French general who became a commander in the American Revolution, a statue of Lafayette stands at the north end of the main green. In 1871, UVM defied custom and admitted two women as students, Four years later, it was the first American university to admit women to full membership into the Phi Beta Kappa Society, the countrys oldest collegiate academic honor society. Likewise, in 1877, it initiated the first African American into the society, in 1924, the first radio broadcast in Vermont occurred from the college station, WCAX, run by students then, now the call sign of a commercial television station. For 73 years, UVM held an annual Kake Walk where students wore blackface, the University of Vermont comprises seven undergraduate schools, an honors college, a graduate college, and a college of medicine. The Honors College does not offer its own degrees, students in the Honors College concurrently enroll in one of the seven undergraduate colleges or schools. UVM is ranked tied for 92nd in U. S. News & World Reports 2017 national university rankings, and is ranked tied for 38th among public universities
21.
National Geographic
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National Geographic is the official magazine of the National Geographic Society. It has been published continuously since its first issue in 1888 and it primarily contains articles about science, geography, history, and world culture. The magazine is known for its thick square-bound glossy format with a rectangular border. The magazine is published monthly, and additional map supplements are also included with subscriptions and it is available in a traditional printed edition and through an interactive online edition. On occasion, special editions of the magazine are issued and this includes a US circulation of 3.5 million. From the 1970s through about 2010 the magazine was printed in Corinth, Mississippi, the current Editor-in-Chief of the National Geographic Magazine is Susan Goldberg. Goldberg is also Editorial Director for National Geographic Partners, overseeing the print and she is responsible for News, Books, National Geographic Traveler magazine, National Geographic History magazine, Maps, and all digital content with the exception of National Geographic Kids. Goldberg reports to Declan Moore, CEO of National Geographic Partners, the first issue of National Geographic Magazine was published on September 22,1888, nine months after the Society was founded. The June 1985 cover portrait of the presumed to be 12-year-old Afghan girl Sharbat Gula, shot by photographer Steve McCurry, in the late 1990s, the magazine began publishing The Complete National Geographic, a digital compilation of all the past issues of the magazine. It was then sued over copyright of the magazine as a work in Greenberg v. National Geographic and other cases. The magazine eventually prevailed in the dispute, and in July 2009 it resumed publishing a compilation containing all issues through December 2008. The compilation was updated to make more recent issues available. National Geographic Kids, the version of the magazine, was launched in 1975 under the name National Geographic World. The January 2017 issue of National Geographic has a nine-year-old transgender girl on the cover, the magazine printed articles on Berlin, de-occupied Austria, the Soviet Union, and Communist China that deliberately downplayed politics to focus on culture. In its coverage of the Space Race, National Geographic focused on the scientific achievement while largely avoiding reference to the connection to nuclear arms buildup. There were also articles in the 1930s, 40s and 50s about the individual states and their resources. Many of these articles were written by longtime staff such as Frederick Simpich, there were also articles about biology and science topics. In later years articles became outspoken on issues such as issues, deforestation, chemical pollution, global warming
22.
Nature (journal)
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Nature is an English multidisciplinary scientific journal, first published on 4 November 1869. Nature claims a readership of about 3 million unique readers per month. The journal has a circulation of around 53,000. There are also sections on books and arts, the remainder of the journal consists mostly of research papers, which are often dense and highly technical. There are many fields of research in which important new advances, the papers that have been published in this journal are internationally acclaimed for maintaining high research standards. In 2007 Nature received the Princess of Asturias Award for Communications, the enormous progress in science and mathematics during the 19th century was recorded in journals written mostly in German or French, as well as in English. Britain underwent enormous technological and industrial changes and advances particularly in the half of the 19th century. In addition, during this period, the number of popular science periodicals doubled from the 1850s to the 1860s. According to the editors of these popular science magazines, the publications were designed to serve as organs of science, in essence, Nature, first created in 1869, was not the first magazine of its kind in Britain. While Recreative Science had attempted to more physical sciences such as astronomy and archaeology. Two other journals produced in England prior to the development of Nature were the Quarterly Journal of Science and Scientific Opinion, established in 1864 and 1868 and these similar journals all ultimately failed. The Popular Science Review survived longest, lasting 20 years and ending its publication in 1881, Recreative Science ceased publication as the Student, the Quarterly Journal, after undergoing a number of editorial changes, ceased publication in 1885. The Reader terminated in 1867, and finally, Scientific Opinion lasted a mere 2 years, janet Browne has proposed that far more than any other science journal of the period, Nature was conceived, born, and raised to serve polemic purpose. Perhaps it was in part its scientific liberality that made Nature a longer-lasting success than its predecessors and this is what Lockyers journal did from the start. Norman Lockyer, the founder of Nature, was a professor at Imperial College and he was succeeded as editor in 1919 by Sir Richard Gregory. Gregory helped to establish Nature in the scientific community. During the years 1945 to 1973, editorship of Nature changed three times, first in 1945 to A. J. V. Gale and L. J. F. Brimble, then to John Maddox in 1965, and finally to David Davies in 1973. In 1980, Maddox returned as editor and retained his position until 1995, philip Campbell has since become Editor-in-chief of all Nature publications
23.
Popular Science
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Popular Science is an American bi-monthly magazine carrying popular science content, which refers to articles for the general reader on science and technology subjects. Popular Science has won over 58 awards, including the American Society of Magazine Editors awards for its excellence in both 2003 and 2004. With roots beginning in 1872, PopSci has been translated into over 30 languages and is distributed to at least 45 countries. The Popular Science Monthly, as the publication was called, was founded in May 1872 by Edward L. Youmans to disseminate scientific knowledge to the educated layman. Youmans had previously worked as an editor for the weekly Appletons Journal, early issues were mostly reprints of English periodicals. William Jay Youmans, Edwards brother, helped found Popular Science Monthly in 1872 and was an editor as well and he became editor-in-chief on Edwards death in 1887. The publisher, D. Appleton & Company, was forced for economic reasons to sell the journal in 1900, james McKeen Cattell became the editor in 1900 and the publisher in 1901. Cattell had a background in academics and continued publishing articles for educated readers, by 1915 the readership was declining and publishing a science journal was a financial challenge. The existing journal would continue the tradition as Scientific Monthly. Existing subscribers would remain subscribed under the new name, Scientific Monthly was published until 1958 when it was absorbed into Science. The Modern Publishing Company acquired the Popular Science Monthly name and this company had purchased Electrician and Mechanic magazine in 1914 and over the next two years merged several magazines together into a science magazine for a general audience. The October 1915 issue was titled Popular Science Monthly and Worlds Advance, the volume number was that of Popular Science but the content was that of Worlds Advance. The new editor was Waldemar Kaempffert, an editor of Scientific American. The change in Popular Science Monthly was dramatic, the old version was a scholarly journal that had eight to ten articles in a 100-page issue. There would be ten to twenty photographs or illustrations, the new version had hundreds of short, easy to read articles with hundreds of illustrations. Editor Kaempffert was writing for the craftsman and hobbyist who wanted to know something about the world of science. The circulation doubled in the first year, from the mid-1930s to the 1960s, the magazine featured fictional stories of Gus Wilsons Model Garage, centered on car problems. An annual review of changes to the new model year cars ran in 1940 and 41 and it continued until the mid-1970s when the magazine reverted to publishing the new models over multiple issues as information became available
24.
Scientific American
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Scientific American is an American popular science magazine. Many famous scientists, including Albert Einstein, have contributed articles in the past 170 years and it is the oldest continuously published monthly magazine in the United States. Scientific American was founded by inventor and publisher Rufus M. Porter in 1845 as a weekly newspaper. Throughout its early years, much emphasis was placed on reports of what was going on at the U. S, current issues include a this date in history section, featuring excerpts from articles originally published 50,100, and 150 years earlier. Topics include humorous incidents, wrong-headed theories, and noteworthy advances in the history of science, Porter sold the publication to Alfred Ely Beach and Orson Desaix Munn a mere ten months after founding it. Until 1948, it remained owned by Munn & Company, under Munns grandson, Orson Desaix Munn III, it had evolved into something of a workbench publication, similar to the twentieth-century incarnation of Popular Science. In the years after World War II, the fell into decline. Thus the partners—publisher Gerard Piel, editor Dennis Flanagan, and general manager Donald H. Miller, Miller retired in 1979, Flanagan and Piel in 1984, when Gerard Piels son Jonathan became president and editor, circulation had grown fifteen-fold since 1948. In 1986, it was sold to the Holtzbrinck group of Germany, in the fall of 2008, Scientific American was put under the control of Nature Publishing Group, a division of Holtzbrinck. Donald Miller died in December 1998, Gerard Piel in September 2004, Mariette DiChristina is the current editor-in-chief, after John Rennie stepped down in June 2009. Scientific American published its first foreign edition in 1890, the Spanish-language La America Cientifica, a Russian edition V Mire Nauki was launched in the Soviet Union in 1983, and continues in the present-day Russian Federation. Kexue, a simplified Chinese edition launched in 1979, was the first Western magazine published in the Peoples Republic of China, founded in Chongqing, the simplified Chinese magazine was transferred to Beijing in 2001. Later in 2005, an edition, Global Science, was published instead of Kexue. A traditional Chinese edition, known as 科學人, was introduced to Taiwan in 2002, the Hungarian edition Tudomány existed between 1984 and 1992. In 1986, an Arabic edition, Oloom magazine, was published, in 2002, a Portuguese edition was launched in Brazil. From 1902 to 1911, Scientific American supervised the publication of the Encyclopedia Americana and it originally styled itself The Advocate of Industry and Enterprise and Journal of Mechanical and other Improvements. On the front page of the first issue was the engraving of Improved Rail-Road Cars, the masthead had a commentary as follows, Scientific American published every Thursday morning at No.11 Spruce Street, New York, No.16 State Street, Boston, and No. 2l Arcade Philadelphia, by Rufus Porter, five copies will be sent to one address six months for four dollars in advance
25.
William Jackson Humphreys
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William Jackson Humphreys was an American physicist and atmospheric researcher. Humphreys was born on February 3,1862 in Gap Mills, West Virginia to Jackson and Eliza Ann Humphreys. He studied physics at Washington & Lee University in Virginia and later at Johns Hopkins University in Baltimore and he worked in the fields of spectroscopy, atmospheric physics and meteorology. In the field of spectroscopy he found the shift of spectral lines under pressure, in atmospheric physics he found a very good model for the stratosphere in 1909. He wrote numerous books, including a textbook titled Physics of the Air, first published in 1920 and considered a work of the time. He also held teaching positions at universities. He concluded that the 1815 eruption of Mount Tambora was responsible for the subsequent cooling known as the Year Without a Summer, from 1905 to 1935 he worked as a physicist for the U. S. Weather Bureau, predecessor of the National Weather Service. He died on November 10,1949 in Washington, D. C, Physics of the Air Weather proverbs and paradoxes Fogs and clouds, The Williams & Wilins Co. Rain making and Other weather vagaries Snow crystals
