1.
Wood
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Wood is a porous and fibrous structural tissue found in the stems and roots of trees, and other woody plants. It is a material, a natural composite of cellulose fibers which are strong in tension embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, in a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots, Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. In 2005, the stock of forests worldwide was about 434 billion cubic meters. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy, in 1991 approximately 3.5 billion cubic meters of wood were harvested. Dominant uses were for furniture and building construction, a 2011 discovery in the Canadian province of New Brunswick discovered the earliest known plants to have grown wood, approximately 395 to 400 million years ago. Wood can be dated by carbon dating and in species by dendrochronology to make inferences about when a wooden object was created. People have used wood for millennia for many purposes, primarily as a fuel or as a material for making houses, tools, weapons, furniture, packaging, artworks. Constructions using wood date back ten thousand years, buildings like the European Neolithic long house were made primarily of wood. Recent use of wood has changed by the addition of steel. The year-to-year variation in tree-ring widths and isotopic abundances gives clues to the climate at that time. This process is known as growth, it is the result of cell division in the vascular cambium, a lateral meristem. These cells then go on to form thickened secondary cell walls, composed mainly of cellulose, hemicellulose, if the distinctiveness between seasons is annual, these growth rings are referred to as annual rings. Where there is little seasonal difference growth rings are likely to be indistinct or absent, if the bark of the tree has been removed in a particular area, the rings will likely be deformed as the plant overgrows the scar. It is usually lighter in color than that near the portion of the ring. The outer portion formed later in the season is known as the latewood or summerwood. However, there are differences, depending on the kind of wood
2.
The Bahamas
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The Bahamas, known officially as the Commonwealth of the Bahamas, is an archipelagic state within the Lucayan Archipelago. The capital is Nassau on the island of New Providence, the designation of the Bahamas can refer either to the country or to the larger island chain that it shares with the Turks and Caicos Islands. As stated in the mandate/manifesto of the Royal Bahamas Defence Force, the Bahamas is the site of Columbus first landfall in the New World in 1492. At that time, the islands were inhabited by the Lucayan, although the Spanish never colonised the Bahamas, they shipped the native Lucayans to slavery in Hispaniola. The islands were mostly deserted from 1513 until 1648, when English colonists from Bermuda settled on the island of Eleuthera, the Bahamas became a British Crown colony in 1718, when the British clamped down on piracy. After the American War of Independence, the Crown resettled thousands of American Loyalists in the Bahamas, they brought their slaves with them, Africans constituted the majority of the population from this period. Slavery in the Bahamas was abolished in 1834, Today the descendants of slaves and free Africans make up nearly 90% of the population, issues related to the slavery years are part of society. The Bahamas became an independent Commonwealth realm in 1973, retaining Queen Elizabeth II as its monarch, in terms of gross domestic product per capita, the Bahamas is one of the richest countries in the Americas, with an economy based on tourism and finance. The name Bahamas is derived from either the Taino ba ha ma, alternatively, it may originate from Guanahani, a local name of unclear meaning. In English, the Bahamas is one of two countries whose self-standing short name begins with the word the, along with The Gambia. Taino people moved into the uninhabited southern Bahamas from Hispaniola and Cuba around the 11th century and they came to be known as the Lucayan people. An estimated 30,000 Lucayan inhabited the Bahamas at the time of Christopher Columbus arrival in 1492, Columbuss first landfall in the New World was on an island he named San Salvador. Some researchers believe this site to be present-day San Salvador Island, an alternative theory holds that Columbus landed to the southeast on Samana Cay, according to calculations made in 1986 by National Geographic writer and editor Joseph Judge, based on Columbuss log. Evidence in support of this remains inconclusive, on the landfall island, Columbus made first contact with the Lucayan and exchanged goods with them. The Spanish forced much of the Lucayan population to Hispaniola for use as forced labour, the slaves suffered from harsh conditions and most died from contracting diseases to which they had no immunity, half of the Taino died from smallpox alone. The population of the Bahamas was severely diminished, in 1648, the Eleutherian Adventurers, led by William Sayle, migrated from Bermuda. These English Puritans established the first permanent European settlement on an island which they named Eleuthera—the name derives from the Greek word for freedom and they later settled New Providence, naming it Sayles Island after one of their leaders. To survive, the settlers salvaged goods from wrecks, in 1670 King Charles II granted the islands to the Lords Proprietors of the Carolinas in North America
3.
Jamaica
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Jamaica is an island country situated in the Caribbean Sea, consisting of the third-largest island of the Greater Antilles. The island,10,990 square kilometres in area, lies about 145 kilometres south of Cuba, Jamaica is the fourth-largest island country in the Caribbean, by area. Inhabited by the indigenous Arawak and Taíno peoples, the island came under Spanish rule following the arrival of Christopher Columbus in 1494, Many of the indigenous people died of disease, and the Spanish imported African slaves as labourers. Named Santiago, the island remained a possession of Spain until 1655, under British colonial rule Jamaica became a leading sugar exporter, with its plantation economy highly dependent on slaves imported from Africa. The British fully emancipated all slaves in 1838, and many chose to have subsistence farms rather than to work on plantations. Beginning in the 1840s, the British imported Chinese and Indian indentured labour to work on plantations, the island achieved independence from the United Kingdom on 6 August 1962. With 2.8 million people, Jamaica is the third-most populous Anglophone country in the Americas, Kingston is the countrys capital and largest city, with a population of 937,700. Jamaicans predominately have African ancestry, with significant European, Chinese, Hakka, Indian, due to a high rate of emigration for work since the 1960s, Jamaica has a large diaspora around the world, particularly in Canada, the United Kingdom, and the United States. Jamaica is a Commonwealth realm, with Queen Elizabeth II as its monarch and her appointed representative in the country is the Governor-General of Jamaica, an office held by Sir Patrick Allen since 2009. Andrew Holness has served as the head of government and Prime Minister of Jamaica from March 2016, the indigenous people, the Taíno, called it Xaymaca in Arawakan, meaning the Land of Wood and Water or the Land of Springs. Colloquially Jamaicans refer to their island as the Rock. Slang names such as Jamrock, Jamdown, or briefly Ja, have derived from this, the Arawak and Taíno indigenous people, originating in South America, settled on the island between 4000 and 1000 BC. When Christopher Columbus arrived in 1494, there were more than 200 villages ruled by caciques, the south coast of Jamaica was the most populated, especially around the area now known as Old Harbour. The Taino still inhabited Jamaica when the English took control of the island in 1655, the Jamaican National Heritage Trust is attempting to locate and document any evidence of the Taino/Arawak. Christopher Columbus claimed Jamaica for Spain after landing there in 1494 and his probable landing point was Dry Harbour, now called Discovery Bay, although there is some debate that it might have been St. Anns Bay. St. Anns Bay was named Saint Gloria by Columbus, as the first sighting of the land, the capital was moved to Spanish Town, then called St. Jago de la Vega, around 1534. Spanish Town has the oldest cathedral of the British colonies in the Caribbean, the Spanish were forcibly evicted by the English at Ocho Rios in St. Ann. In 1655, the English, led by Sir William Penn and General Robert Venables, the English continued to import African slaves as labourers
4.
Endangered species
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An endangered species is a species which has been categorized as likely to become extinct. In 2012, the IUCN Red List featured 3079 animal and 2655 plant species as endangered worldwide, the figures for 1998 were, respectively,1102 and 1197. Many nations have laws that protect conservation-reliant species, for example, population numbers, trends and species conservation status can be found in the lists of organisms by population. The conservation status of a species indicates the likelihood that it will become extinct, the IUCN Red List of Threatened Species is the best-known worldwide conservation status listing and ranking system. Over 40% of the species are estimated to be at risk of extinction. Internationally,199 countries have signed an accord to create Biodiversity Action Plans that will protect endangered, in the United States, such plans are usually called Species Recovery Plans. Those species of Near Threatened and Least Concern status have been assessed and found to have relatively robust and healthy populations, though these may be in decline. The IUCN categories, with examples of animals classified by them, include, Extinct Extinct in the wild Captive individuals survive, critically endangered Faces an extremely high risk of extinction in the immediate future. Endangered Faces a high risk of extinction in the near future, vulnerable Faces a high risk of endangerment in the medium term. Near-threatened May be considered threatened in the near future, Least concern No immediate threat to species survival. A population size reduction of ≥ 50%, projected or suspected to be met within the next 10 years or three generations, whichever is the longer, based on any of to under A1. E) Quantitative analysis showing the probability of extinction in the wild is at least 20% within 20 years or five generations, there is data from the United States that shows a correlation between human populations and threatened and endangered species. Under the Endangered Species Act in the United States, species may be listed as endangered or threatened, the Salt Creek tiger beetle is an example of an endangered subspecies protected under the ESA. Some endangered species laws are controversial, also lobbying from hunters and various industries like the petroleum industry, construction industry, and logging, has been an obstacle in establishing endangered species laws. The Bush administration lifted a policy that required federal officials to consult an expert before taking actions that could damage endangered species. Under the Obama administration, this policy has been reinstated, being listed as an endangered species can have negative effect since it could make a species more desirable for collectors and poachers. This effect is potentially reducible, such as in China where commercially farmed turtles may be reducing some of the pressure to poach endangered species. Another problem with the species is its effect of inciting the use of the shoot, shovel
5.
Materials science
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The interdisciplinary field of materials science, also commonly termed materials science and engineering, involves the discovery and design of new materials, with an emphasis on solids. Materials science still incorporates elements of physics, chemistry, and engineering, as such, the field was long considered by academic institutions as a sub-field of these related fields. Materials science is a syncretic discipline hybridizing metallurgy, ceramics, solid-state physics and it is the first example of a new academic discipline emerging by fusion rather than fission. Many of the most pressing scientific problems humans currently face are due to the limits of the materials that are available, thus, breakthroughs in materials science are likely to affect the future of technology significantly. Materials scientists emphasize understanding how the history of a material influences its structure, the understanding of processing-structure-properties relationships is called the § materials paradigm. This paradigm is used to advance understanding in a variety of areas, including nanotechnology, biomaterials. Such investigations are key to understanding, for example, the causes of various accidents and incidents. The material of choice of a given era is often a defining point, phrases such as Stone Age, Bronze Age, Iron Age, and Steel Age are great examples. Originally deriving from the manufacture of ceramics and its putative derivative metallurgy, materials science is one of the oldest forms of engineering, modern materials science evolved directly from metallurgy, which itself evolved from mining and ceramics and the use of fire. Materials science has driven, and been driven by, the development of technologies such as rubbers, plastics, semiconductors. Before the 1960s, many materials science departments were named metallurgy departments, reflecting the 19th, a material is defined as a substance that is intended to be used for certain applications. There are a myriad of materials around us—they can be found in anything from buildings to spacecraft, Materials can generally be divided into two classes, crystalline and non-crystalline. The traditional examples of materials are metals, semiconductors, ceramics, New and advanced materials that are being developed include nanomaterials and biomaterials, etc. The basis of science involves studying the structure of materials. Once a materials scientist knows about this structure-property correlation, they can go on to study the relative performance of a material in a given application. The major determinants of the structure of a material and thus of its properties are its constituent chemical elements and these characteristics, taken together and related through the laws of thermodynamics and kinetics, govern a materials microstructure, and thus its properties. As mentioned above, structure is one of the most important components of the field of materials science, Materials science examines the structure of materials from the atomic scale, all the way up to the macro scale. Characterization is the way materials scientists examine the structure of a material, structure is studied at various levels, as detailed below
6.
Polymer
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A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Because of their range of properties, both synthetic and natural polymers play an essential and ubiquitous role in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure, Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. The units composing polymers derive, actually or conceptually, from molecules of low molecular mass. The term was coined in 1833 by Jöns Jacob Berzelius, though with a distinct from the modern IUPAC definition. The modern concept of polymers as covalently bonded macromolecular structures was proposed in 1920 by Hermann Staudinger, Polymers are studied in the fields of biophysics and macromolecular science, and polymer science. Polyisoprene of latex rubber is an example of a polymer. In biological contexts, essentially all biological macromolecules—i. e, proteins, nucleic acids, and polysaccharides—are purely polymeric, or are composed in large part of polymeric components—e. g. Isoprenylated/lipid-modified glycoproteins, where small molecules and oligosaccharide modifications occur on the polyamide backbone of the protein. The simplest theoretical models for polymers are ideal chains, Polymers are of two types, Natural polymeric materials such as shellac, amber, wool, silk and natural rubber have been used for centuries. A variety of natural polymers exist, such as cellulose. Most commonly, the continuously linked backbone of a used for the preparation of plastics consists mainly of carbon atoms. A simple example is polyethylene, whose repeating unit is based on ethylene monomer, however, other structures do exist, for example, elements such as silicon form familiar materials such as silicones, examples being Silly Putty and waterproof plumbing sealant. Oxygen is also present in polymer backbones, such as those of polyethylene glycol, polysaccharides. Polymerization is the process of combining many small molecules known as monomers into a covalently bonded chain or network, during the polymerization process, some chemical groups may be lost from each monomer. This is the case, for example, in the polymerization of PET polyester, the distinct piece of each monomer that is incorporated into the polymer is known as a repeat unit or monomer residue. Laboratory synthetic methods are divided into two categories, step-growth polymerization and chain-growth polymerization. However, some methods such as plasma polymerization do not fit neatly into either category
7.
Alloy
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An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character, an alloy may be a solid solution of metal elements or a mixture of metallic phases. Intermetallic compounds are alloys with a stoichiometry and crystal structure. Zintl phases are sometimes considered alloys depending on bond types. Alloys are used in a variety of applications. In some cases, a combination of metals may reduce the overall cost of the material while preserving important properties, in other cases, the combination of metals imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass, pewter, duralumin, bronze, the alloy constituents are usually measured by mass. Alloys are usually classified as substitutional or interstitial alloys, depending on the arrangement that forms the alloy. They can be classified as homogeneous, or heterogeneous or intermetallic. An alloy is a mixture of elements, which forms an impure substance that retains the characteristics of a metal. Alloys are made by mixing two or more elements, at least one of which is a metal and this is usually called the primary metal or the base metal, and the name of this metal may also be the name of the alloy. The other constituents may or may not be metals but, when mixed with the base, they will be soluble. The mechanical properties of alloys will often be different from those of its individual constituents. A metal that is very soft, such as aluminium, can be altered by alloying it with another soft metal. Although both metals are soft and ductile, the resulting aluminium alloy will have much greater strength. Adding a small amount of carbon to iron trades its great ductility for the greater strength of an alloy called steel. Due to its strength, but still substantial toughness, and its ability to be greatly altered by heat treatment, steel is one of the most useful. By adding chromium to steel, its resistance to corrosion can be enhanced, creating stainless steel, while adding silicon will alter its electrical characteristics, producing silicon steel
8.
Tea
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Tea is an aromatic beverage commonly prepared by pouring hot or boiling water over cured leaves of the Camellia sinensis, an evergreen shrub native to Asia. After water, it is the most widely consumed drink in the world, Tea originated in Southwest China, where it was used as a medicinal drink. It was popularized as a drink during the Chinese Tang dynasty. Portuguese priests and merchants introduced it to Europe during the 16th century, during the 17th century, drinking tea became fashionable among Britons, who started large-scale production and commercialization of the plant in India to bypass the Chinese monopoly. The term herbal tea usually refers to infusions of fruit or herbs made without the tea plant, such as steeps of rosehip, chamomile and these are sometimes called tisanes or herbal infusions to prevent confusion with tea made from the tea plant. The tea industry often uses the term fruit tea to refer to what are in fact fruit-flavored black teas. The Chinese character for tea is 茶, originally written with a stroke as 荼. The word is pronounced differently in the different varieties of Chinese, such as chá in Mandarin, zo and dzo in Wu Chinese, there were other ancient words for tea, though ming is the only other one still in common use. Most Chinese languages, such as Mandarin and Cantonese, pronounce it along the lines of cha and these two pronunciations have made their separate ways into other languages around the world. Starting in the seventeen century, the Dutch played a dominant role in the early European tea trade via the Dutch East India Company. The Dutch borrowed the word for tea from Min Chinese, either through trade directly from Fujian or Formosa where they had established a port, or from Malay traders in Bantam, Java. The Dutch then introduced to other European languages this Min pronunciation for tea, including English tea, French thé, Spanish té and this pronunciation is also the most common form worldwide. The Portuguese adopted the Cantonese pronunciation chá, and spread it to India, the Korean and Japanese pronunciations of cha were borrowed into Korean and Japanese during earlier periods of Chinese history. A third form, the increasingly widespread chai, came from Persian چای chay, both the châ and chây forms are found in Persian dictionaries. English has all three forms, cha or char, attested from the 16th century, tea, from the 17th, however, the form chai refers specifically to a black tea mixed with honey, spices and milk in contemporary English. Tea plants are native to East Asia, and probably originated around the points of the lands of north Burma. Tea drinking may have begun in the Yunnan region during the Shang Dynasty in China, Chinese legends attribute the invention of tea to Shennong in 2737 BC, although evidence suggests that tea drinking may have been introduced from the southwest of China. The earliest written records of tea come from China, in the Chronicles of Huayang, it was recorded that the Ba people in Sichuan presented tu to the Zhou king
9.
Woodturning
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Woodturning is the craft of using the wood lathe with hand-held tools to cut a shape that is symmetrical around the axis of rotation. Like the potters wheel, the lathe is a simple mechanism which can generate a variety of forms. The operator is known as a turner, and the skills needed to use the tools were known as turnery. In pre-industrial England, these skills were sufficiently difficult to be known as the misterie of the turners guild. The skills to use the tools by hand, without a point of contact with the wood, distinguish woodturning. Industrial production has replaced many of products from the traditional turning shop. However, the lathe is still used for decentralized production of limited or custom turnings. A skilled turner can produce a variety of objects with five or six simple tools. The tools can be reshaped easily for the task at hand, in many parts of the world, the lathe has been a portable tool that goes to the source of the wood, or adapts to temporary workspaces. 21st-century turners restore furniture, continue folk-art traditions, produce custom architectural work, woodturning appeals to people who like to work with their hands, find pleasure in problem-solving, or enjoy the tactile and visual qualities of wood. Wood lathes work with either reciprocating or continuous revolution, the reciprocating lathe is powered by a bow or a spring, rotating the wood first in one direction, and then in the other. The turner cuts on just one side of the rotation, as with the pole lathe, the reciprocating lathe may be human-powered with a bow, as well as with spring mechanisms. The reciprocating lathe, while primitive technology requiring considerable dexterity to operate, is capable of excellent results in skilled hands, for example, reciprocating bow lathes are still used to turn beads for the Arabian lattice windows called Meshrebeeyeh that so charmed Holtzapffel in the 1880s. Continuous revolution of the workpiece can be human-powered with a wheel, or achieved with water, steam. The style of cutting does not have the pause required by the reciprocating lathes rotation, even with continuous revolution, however, the turner controls the contact of tool and wood entirely by hand. The cutters are not fixed, nor advanced automatically, as with the metal-working lathe, the nature of wood defines woodturning techniques. The orientation of the grain, relative to the axis of the lathe, affects the tools. In spindle turning, the grain runs lengthwise along the lathe bed, grain is thus always perpendicular to the direction of rotation under the tool
