Otto Hahn was a German chemist and pioneer in the fields of radioactivity and radiochemistry. Otto Hahn discovered nuclear fission in 1938, he is referred to as the father of nuclear chemistry. He was awarded the Nobel Prize in Chemistry in 1944 for the discovery and the radiochemical proof of nuclear fission; this process is exploited by nuclear reactors and is one of the basics of nuclear weapons that were developed in the U. S. during World War II. He served as the last President of the Kaiser Wilhelm Society in 1946 and as the founding President of the Max Planck Society from 1948 to 1960. Considered by many to be a model for scholarly excellence and personal integrity, he became one of the most influential and respected citizens of the new postwar country West Germany. Hahn was an opponent of Jewish persecution by the Nazi Party. Albert Einstein wrote that Hahn was "one of the few who stood upright and did the best he could in these years of evil". After World War II, Hahn became a passionate campaigner against the use of nuclear energy as a weapon.
Hahn was the youngest son of Heinrich Hahn, a prosperous glazier and entrepreneur, Charlotte Hahn, née Giese. Together with his brothers Karl and Julius, Otto was raised in a sheltered environment. At the age of 15, he began to take a special interest in chemistry, carried out simple experiments in the laundry room of the family home, his father wanted Otto to study architecture, as he had built or acquired several residential and business properties, but Otto persuaded him that his ambition was to become an industrial chemist. In 1897, after taking his Abitur at the Klinger Oberrealschule in Frankfurt, Hahn began to study chemistry and mineralogy at the University of Marburg, his subsidiary subjects were philosophy. Hahn joined the Students' Association of Natural Sciences and Medicine, a student fraternity and a forerunner of today's "Landsmannschaft Nibelungia", he spent his fourth semesters studying under Adolf von Baeyer at the University of Munich. In 1901, Hahn received his doctorate in Marburg for a dissertation entitled On Bromine Derivates of Isoeugenol, a topic in classical organic chemistry.
After completing his one-year military service, the young chemist returned to the University of Marburg, where for two years he worked as assistant to his doctoral supervisor, Geheimrat Professor Theodor Zincke. His long-time scientific collaborator Nikolaus Riehl claimed that the family had "a Jewish antecedent", but this didn't hinder Hahn's academic career during the Nazi era. According to journalist Bernt Engelmann, Hahn was thought of as Jewish because of his "Jewish sounding" surname, but he instead asserts that Hahn only had Jewish ancestors on his maternal side of the family despite "Giese" not being a traditional Jewish surname. Engelmann claimed that this Jewish ancestry was an "anxiously guarded secret", "hushed up because German science could not afford the loss of this scientist of the highest international repute." However, one of Lise Meitner's principal biographers was skeptical of this claim of Jewish maternal ancestry, noting that Engelmann made numerous factual errors in his book.
She speculates that it may have been a malicious rumor, similar to the one that affected Max Planck, falsely accused by his enemies in the Reich of having Jewish ancestors on his maternal side Hahn's intention had been to work in industry. With this in mind, to improve his knowledge of English, he took up a post at University College London in 1904, working under Sir William Ramsay, known for having discovered the inert gases. Here Hahn worked on radiochemistry, at that time a new field. In early 1905, in the course of his work with salts of radium, Hahn discovered a new substance he called radiothorium, which at that time was believed to be a new radioactive element.. Ramsay was enthusiastic when yet another new element was found in his institute, he intended to announce the discovery in a correspondingly suitable way. In accordance with tradition this should be done before the committee of the venerable Royal Society. At the session of the Royal Society on the 16 March 1905 Ramsay communicated Hahn's discovery of radiothorium, the press was interested.
The Daily Telegraph informed its readers: A NEW ELEMENT - Very soon the scientific papers will be agog with a new discovery, added to the many brilliant triumphs of Gower Street. Dr. Otto Hahn, working at University College, has discovered a new radioactive element, extracted from a mineral from Ceylon, named Thorianite, it is conjectured, the substance which renders thorium radioactive, its activity is at least 250,000 times as great as that of thorium, weight for weight. It gives off a gas, identical with the radioactive emanation from thorium. Another theory of deep interest is that it is the possible source of a radioactive element stronger in radioactivity than radium itself, capable of producing all the curious effects which are known of radium up to the present. - The discoverer read a paper on the subject to the Royal Society last week, this should rank, when published, among the most original of recent contributions to scientific literature. For the first time the name of Otto Hahn was mentioned in connection with radium research, his "New radioactive Element, which evolves Thorium Emanation" was published in
Columbia University is a private Ivy League research university in Upper Manhattan, New York City. Established in 1754, Columbia is the oldest institution of higher education in New York and the fifth-oldest institution of higher learning in the United States, it is one of nine colonial colleges founded prior to the Declaration of Independence, seven of which belong to the Ivy League. It has been ranked by numerous major education publications as among the top ten universities in the world. Columbia was established as King's College by royal charter of George II of Great Britain in reaction to the founding of Princeton University in New Jersey, it was renamed Columbia College in 1784 following the Revolutionary War and in 1787 was placed under a private board of trustees headed by former students Alexander Hamilton and John Jay. In 1896, the campus was moved from Madison Avenue to its current location in Morningside Heights and renamed Columbia University. Columbia scientists and scholars have played an important role in the development of notable scientific fields and breakthroughs including: brain-computer interface.
The Columbia University Physics Department has been affiliated with 33 Nobel Prize winners as alumni, faculty or research staff, the third most of any American institution behind MIT and Harvard. In addition, 22 Nobel Prize winners in Physiology and Medicine have been affiliated with Columbia, the third most of any American institution; the university's research efforts include the Lamont-Doherty Earth Observatory, Goddard Institute for Space Studies and accelerator laboratories with major technology firms such as IBM. Columbia is one of the fourteen founding members of the Association of American Universities and was the first school in the United States to grant the M. D. degree. The university administers the Pulitzer Prize annually. Columbia is organized into twenty schools, including three undergraduate schools and numerous graduate schools, it maintains research centers outside of the United States known as Columbia Global Centers. In 2018, Columbia's undergraduate acceptance rate was 5.1%, making it one of the most selective colleges in the United States, the second most selective in the Ivy League after Harvard.
Columbia is ranked as the 3rd best university in the United States by U. S. News & World Report behind Princeton and Harvard. In athletics, the Lions field varsity teams in 29 sports as a member of the NCAA Division I Ivy League conference; the university's endowment stood at $10.9 billion in 2018, among the largest of any academic institution. As of 2018, Columbia's alumni and affiliates include: five Founding Fathers of the United States — among them an author of the United States Constitution and co-author of the Declaration of Independence. S. presidents. Discussions regarding the founding of a college in the Province of New York began as early as 1704, at which time Colonel Lewis Morris wrote to the Society for the Propagation of the Gospel in Foreign Parts, the missionary arm of the Church of England, persuading the society that New York City was an ideal community in which to establish a college. However, it was not until the founding of the College of New Jersey across the Hudson River in New Jersey that the City of New York considered founding a college.
In 1746, an act was passed by the general assembly of New York to raise funds for the foundation of a new college. In 1751, the assembly appointed a commission of ten New York residents, seven of whom were members of the Church of England, to direct the funds accrued by the state lottery towards the foundation of a college. Classes were held in July 1754 and were presided over by the college's first president, Dr. Samuel Johnson. Dr. Johnson was the only instructor of the college's first class, which consisted of a mere eight students. Instruction was held in a new schoolhouse adjoining Trinity Church, located on what is now lower Broadway in Manhattan; the college was founded on October 31, 1754, as King's College by royal charter of King George II, making it the oldest institution of higher learning in the state of New York and the fifth oldest in the United States. In 1763, Dr. Johnson was succeeded in the presidency by Myles Cooper, a graduate of The Queen's College, an ardent Tory. In the charged political climate of the American Revolution, his chief opponent in discussions at the college was an undergraduate of the class of 1777, Alexander Hamilton.
The American Revolutionary War broke out in 1776, was catastrophic for the operation of King's College, which suspended instruction for eight years beginning in 1776 with the arrival of the Continental Army. The suspension continued through the military occupation of New York City by British troops until their departure in 1783; the college's library was looted and its sole building requisitioned for use as a military hospital first by American and British forces. Loyalists were forced to abandon their King's College in New York, seized by the rebels and renamed Columbia College; the Loyalists, led by Bishop Charles Inglis fled to Windsor, Nova Scotia, where the
Enrico Fermi was an Italian and naturalized-American physicist and the creator of the world's first nuclear reactor, the Chicago Pile-1. He has been called the "architect of the nuclear age" and the "architect of the atomic bomb", he was one of few physicists to excel in both theoretical physics and experimental physics. Fermi held several patents related to the use of nuclear power, was awarded the 1938 Nobel Prize in Physics for his work on induced radioactivity by neutron bombardment and for the discovery of transuranium elements, he made significant contributions to the development of statistical mechanics, quantum theory, nuclear and particle physics. Fermi's first major contribution involved the field of statistical mechanics. After Wolfgang Pauli formulated his exclusion principle in 1925, Fermi followed with a paper in which he applied the principle to an ideal gas, employing a statistical formulation now known as Fermi–Dirac statistics. Today, particles that obey the exclusion principle are called "fermions".
Pauli postulated the existence of an uncharged invisible particle emitted along with an electron during beta decay, to satisfy the law of conservation of energy. Fermi took up this idea, developing a model that incorporated the postulated particle, which he named the "neutrino", his theory referred to as Fermi's interaction and now called weak interaction, described one of the four fundamental interactions in nature. Through experiments inducing radioactivity with the discovered neutron, Fermi discovered that slow neutrons were more captured by atomic nuclei than fast ones, he developed the Fermi age equation to describe this. After bombarding thorium and uranium with slow neutrons, he concluded that he had created new elements. Although he was awarded the Nobel Prize for this discovery, the new elements were revealed to be nuclear fission products. Fermi left Italy in 1938 to escape new Italian racial laws that affected his Jewish wife, Laura Capon, he emigrated to the United States, where he worked on the Manhattan Project during World War II.
Fermi led the team that designed and built Chicago Pile-1, which went critical on 2 December 1942, demonstrating the first human-created, self-sustaining nuclear chain reaction. He was on hand when the X-10 Graphite Reactor at Oak Ridge, went critical in 1943, when the B Reactor at the Hanford Site did so the next year. At Los Alamos, he headed F Division, part of which worked on Edward Teller's thermonuclear "Super" bomb, he was present at the Trinity test on 16 July 1945, where he used his Fermi method to estimate the bomb's yield. After the war, Fermi served under J. Robert Oppenheimer on the General Advisory Committee, which advised the Atomic Energy Commission on nuclear matters. After the detonation of the first Soviet fission bomb in August 1949, he opposed the development of a hydrogen bomb on both moral and technical grounds, he was among the scientists who testified on Oppenheimer's behalf at the 1954 hearing that resulted in the denial of Oppenheimer's security clearance. Fermi did important work in particle physics related to pions and muons, he speculated that cosmic rays arose when material was accelerated by magnetic fields in interstellar space.
Many awards and institutions are named after Fermi, including the Enrico Fermi Award, the Enrico Fermi Institute, the Fermi National Accelerator Laboratory, the Fermi Gamma-ray Space Telescope, the Enrico Fermi Nuclear Generating Station, the synthetic element fermium, making him one of 16 scientists who have elements named after them. Enrico Fermi was born in Rome, Italy, on 29 September 1901, he was the third child of Alberto Fermi, a division head in the Ministry of Railways, Ida de Gattis, an elementary school teacher. His sister, was two years older than he, his brother Giulio a year older. After the two boys were sent to a rural community to be wet nursed, Enrico rejoined his family in Rome when he was two and a half. Although he was baptised a Roman Catholic in accordance with his grandparents' wishes, his family was not religious; as a young boy he shared the same interests as his brother Giulio, building electric motors and playing with electrical and mechanical toys. Giulio died during an operation on a throat abscess in 1915 and Maria died in an airplane crash near Milan in 1959.
At a local market Fermi found a physics book, the 900-page Elementorum physicae mathematicae. Written in Latin by Jesuit Father Andrea Caraffa, a professor at the Collegio Romano, it presented mathematics, classical mechanics, astronomy and acoustics as they were understood at the time of its 1840 publication. With scientifically inclined friend, Enrico Persico, Fermi pursued projects such as building gyroscopes and measuring the acceleration of Earth's gravity. A colleague of Fermi's father gave him books on physics and mathematics which he assimilated quickly. Fermi graduated from high school in July 1918, at Amidei's urging applied to the Scuola Normale Superiore in Pisa. Having lost one son, his parents only reluctantly allowed him to live in the school's lodgings for four years. Fermi took first place in the difficult entrance exam, which included an essay on the theme of "Specific characteristics of Sounds". At the Scuola Normale Superiore Fermi played pranks with fellow student Franco Rasetti.
Fermi was advised by Luigi Puccianti, director of the physics laborat
Physics is the natural science that studies matter, its motion, behavior through space and time, that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, its main goal is to understand how the universe behaves. Physics is one of the oldest academic disciplines and, through its inclusion of astronomy the oldest. Over much of the past two millennia, chemistry and certain branches of mathematics, were a part of natural philosophy, but during the scientific revolution in the 17th century these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, the boundaries of physics which are not rigidly defined. New ideas in physics explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics enable advances in new technologies.
For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have transformed modern-day society, such as television, domestic appliances, nuclear weapons. Astronomy is one of the oldest natural sciences. Early civilizations dating back to beyond 3000 BCE, such as the Sumerians, ancient Egyptians, the Indus Valley Civilization, had a predictive knowledge and a basic understanding of the motions of the Sun and stars; the stars and planets were worshipped, believed to represent gods. While the explanations for the observed positions of the stars were unscientific and lacking in evidence, these early observations laid the foundation for astronomy, as the stars were found to traverse great circles across the sky, which however did not explain the positions of the planets. According to Asger Aaboe, the origins of Western astronomy can be found in Mesopotamia, all Western efforts in the exact sciences are descended from late Babylonian astronomy.
Egyptian astronomers left monuments showing knowledge of the constellations and the motions of the celestial bodies, while Greek poet Homer wrote of various celestial objects in his Iliad and Odyssey. Natural philosophy has its origins in Greece during the Archaic period, when pre-Socratic philosophers like Thales rejected non-naturalistic explanations for natural phenomena and proclaimed that every event had a natural cause, they proposed ideas verified by reason and observation, many of their hypotheses proved successful in experiment. The Western Roman Empire fell in the fifth century, this resulted in a decline in intellectual pursuits in the western part of Europe. By contrast, the Eastern Roman Empire resisted the attacks from the barbarians, continued to advance various fields of learning, including physics. In the sixth century Isidore of Miletus created an important compilation of Archimedes' works that are copied in the Archimedes Palimpsest. In sixth century Europe John Philoponus, a Byzantine scholar, questioned Aristotle's teaching of physics and noting its flaws.
He introduced the theory of impetus. Aristotle's physics was not scrutinized until John Philoponus appeared, unlike Aristotle who based his physics on verbal argument, Philoponus relied on observation. On Aristotle's physics John Philoponus wrote: “But this is erroneous, our view may be corroborated by actual observation more than by any sort of verbal argument. For if you let fall from the same height two weights of which one is many times as heavy as the other, you will see that the ratio of the times required for the motion does not depend on the ratio of the weights, but that the difference in time is a small one, and so, if the difference in the weights is not considerable, that is, of one is, let us say, double the other, there will be no difference, or else an imperceptible difference, in time, though the difference in weight is by no means negligible, with one body weighing twice as much as the other”John Philoponus' criticism of Aristotelian principles of physics served as an inspiration for Galileo Galilei ten centuries during the Scientific Revolution.
Galileo cited Philoponus in his works when arguing that Aristotelian physics was flawed. In the 1300s Jean Buridan, a teacher in the faculty of arts at the University of Paris, developed the concept of impetus, it was a step toward the modern ideas of momentum. Islamic scholarship inherited Aristotelian physics from the Greeks and during the Islamic Golden Age developed it further placing emphasis on observation and a priori reasoning, developing early forms of the scientific method; the most notable innovations were in the field of optics and vision, which came from the works of many scientists like Ibn Sahl, Al-Kindi, Ibn al-Haytham, Al-Farisi and Avicenna. The most notable work was The Book of Optics, written by Ibn al-Haytham, in which he conclusively disproved the ancient Greek idea about vision, but came up with a new theory. In the book, he presented a study of the phenomenon of the camera obscura (his thousand-year-old
Barium is a chemical element with symbol Ba and atomic number 56. It is a soft, silvery alkaline earth metal; because of its high chemical reactivity, barium is never found in nature as a free element. Its hydroxide, known in pre-modern times as baryta, does not occur as a mineral, but can be prepared by heating barium carbonate; the most common occurring minerals of barium are barite and witherite, both insoluble in water. The name barium originates from the alchemical derivative "baryta", from Greek βαρύς, meaning "heavy." Baric is the adjectival form of barium. Barium was identified as a new element in 1774, but not reduced to a metal until 1808 with the advent of electrolysis. Barium has few industrial applications, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO and electroceramics, is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compounds are added to fireworks to impart a green color.
Barium sulfate is used as an insoluble additive to oil well drilling fluid, as well as in a purer form, as X-ray radiocontrast agents for imaging the human gastrointestinal tract. The soluble barium ion and soluble compounds are poisonous, have been used as rodenticides. Barium is a silvery-white metal, with a slight golden shade when ultrapure; the silvery-white color of barium metal vanishes upon oxidation in air yielding a dark gray oxide layer. Barium has good electrical conductivity. Ultrapure barium is difficult to prepare, therefore many properties of barium have not been measured yet. At room temperature and pressure, barium has a body-centered cubic structure, with a barium–barium distance of 503 picometers, expanding with heating at a rate of 1.8×10−5/°C. It is a soft metal with a Mohs hardness of 1.25. Its melting temperature of 1,000 K is intermediate between those of the lighter strontium and heavier radium; the density is again intermediate between those of radium. Barium is chemically similar to magnesium and strontium, but more reactive.
It always exhibits the oxidation state of +2, except in a few rare and unstable molecular species that are only characterised in the gas phase such as BaF. Reactions with chalcogens are exothermic. Reactions with other nonmetals, such as carbon, phosphorus and hydrogen, are exothermic and proceed upon heating. Reactions with water and alcohols are exothermic and release hydrogen gas: Ba + 2 ROH → Ba2 + H2↑ Barium reacts with ammonia to form complexes such as Ba6; the metal is attacked by most acids. Sulfuric acid is a notable exception because passivation stops the reaction by forming the insoluble barium sulfate on the surface. Barium combines with several metals, including aluminium, zinc and tin, forming intermetallic phases and alloys. Barium salts are white when solid and colorless when dissolved, barium ions provide no specific coloring, they are denser than the calcium analogs, except for the halides. Barium hydroxide was known to alchemists. Unlike calcium hydroxide, it absorbs little CO2 in aqueous solutions and is therefore insensitive to atmospheric fluctuations.
This property is used in calibrating pH equipment. Volatile barium compounds burn with a green to pale green flame, an efficient test to detect a barium compound; the color results from spectral lines at 455.4, 493.4, 553.6, 611.1 nm. Organobarium compounds are a growing field of knowledge: discovered are dialkylbariums and alkylhalobariums. Barium found in the Earth's crust is a mixture of seven primordial nuclides, barium-130, 132, 134 through 138. Barium-130 undergoes slow radioactive decay to xenon-130 by double beta plus decay, barium-132 theoretically decays to xenon-132, with half-lives a thousand times greater than the age of the Universe; the abundance is ≈ 0.1 %. The radioactivity of these isotopes is so weak. Of the stable isotopes, barium-138 composes 71.7% of all barium. In total, barium has about 40 known isotopes, ranging in mass between 114 and 153; the most stable artificial radioisotope is barium-133 with a half-life of 10.51 years. Five other isotopes have half-lives longer than a day.
Barium has 10 meta states, of which barium-133m1 is the most stable with a half-life of about 39 hours. Alchemists in the early Middle Ages knew about some barium minerals. Smooth pebble-like stones of mineral baryte were found in volcanic rock near Bologna, so were called "Bologna stones." Alchemists were attracted to them. The phosphorescent properties of baryte heated with organics were described by V. Casciorolus in 1602. Carl Scheele determined that baryte contained a new element in 1774, but could not isolate barium, only barium oxide. Johan Gottlieb Gahn isolated barium oxide two year
Jews or Jewish people are an ethnoreligious group and a nation, originating from the Israelites and Hebrews of historical Israel and Judah. Jewish ethnicity and religion are interrelated, as Judaism is the traditional faith of the Jewish people, while its observance varies from strict observance to complete nonobservance. Jews originated as an ethnic and religious group in the Middle East during the second millennium BCE, in the part of the Levant known as the Land of Israel; the Merneptah Stele appears to confirm the existence of a people of Israel somewhere in Canaan as far back as the 13th century BCE. The Israelites, as an outgrowth of the Canaanite population, consolidated their hold with the emergence of the kingdoms of Israel and Judah; some consider that these Canaanite sedentary Israelites melded with incoming nomadic groups known as'Hebrews'. Though few sources mention the exilic periods in detail, the experience of diaspora life, from the Ancient Egyptian rule over the Levant, to Assyrian captivity and exile, to Babylonian captivity and exile, to Seleucid Imperial rule, to the Roman occupation and exile, the historical relations between Jews and their homeland thereafter, became a major feature of Jewish history and memory.
Prior to World War II, the worldwide Jewish population reached a peak of 16.7 million, representing around 0.7% of the world population at that time. 6 million Jews were systematically murdered during the Holocaust. Since the population has risen again, as of 2016 was estimated at 14.4 million by the Berman Jewish DataBank, less than 0.2% of the total world population. The modern State of Israel is the only country, it defines itself as a Jewish and democratic state in the Basic Laws, Human Dignity and Liberty in particular, based on the Declaration of Independence. Israel's Law of Return grants the right of citizenship to Jews who have expressed their desire to settle in Israel. Despite their small percentage of the world's population, Jews have influenced and contributed to human progress in many fields, both and in modern times, including philosophy, literature, business, fine arts and architecture, music and cinema, science and technology, as well as religion. Jews have played a significant role in the development of Western Civilization.
The English word "Jew" continues Iewe. These terms derive from Old French giu, earlier juieu, which through elision had dropped the letter "d" from the Medieval Latin Iudaeus, like the New Testament Greek term Ioudaios, meant both "Jew" and "Judean" / "of Judea"; the Greek term was a loan from Aramaic Y'hūdāi, corresponding to Hebrew יְהוּדִי Yehudi the term for a member of the tribe of Judah or the people of the kingdom of Judah. According to the Hebrew Bible, the name of both the tribe and kingdom derive from Judah, the fourth son of Jacob. Genesis 29:35 and 49:8 connect the name "Judah" with the verb yada, meaning "praise", but scholars agree that the name of both the patriarch and the kingdom instead have a geographic origin—possibly referring to the gorges and ravines of the region; the Hebrew word for "Jew" is יְהוּדִי Yehudi, with the plural יְהוּדִים Yehudim. Endonyms in other Jewish languages include the Yiddish ייִד Yid; the etymological equivalent is in use in other languages, e.g. يَهُودِيّ yahūdī, al-yahūd, in Arabic, "Jude" in German, "judeu" in Portuguese, "Juif" /"Juive" in French, "jøde" in Danish and Norwegian, "judío/a" in Spanish, "jood" in Dutch, "żyd" in Polish etc. but derivations of the word "Hebrew" are in use to describe a Jew, e.g. in Italian, in Persian and Russian.
The German word "Jude" is pronounced, the corresponding adjective "jüdisch" is the origin of the word "Yiddish". According to The American Heritage Dictionary of the English Language, fourth edition, It is recognized that the attributive use of the noun Jew, in phrases such as Jew lawyer or Jew ethics, is both vulgar and offensive. In such contexts Jewish is the only acceptable possibility; some people, have become so wary of this construction that they have extended the stigma to any use of Jew as a noun, a practice that carries risks of its own. In a sentence such as There are now several Jews on the council, unobjectionable, the substitution of a circumlocution like Jewish people or persons of Jewish background may in itself cause offense for seeming to imply that Jew has a negative connotation when used as a noun. Judaism shares some of the characteristics of a nation, an ethnicity, a religion, a culture, making the definition of, a Jew vary depending on whether a religious or national approach to identity is used.
In modern secular usage Jews include three groups: people who were born to a Jewish family regardless of whether or not they follow the religion, those who have some Jewish ancestral background or lineage, people without any Jewish ancestral background or lineage who have formally converted to Judaism and therefore are followers of the religion. Historical definitions of Jewish identity have traditionally been based on halakhic definitions of matrilineal descent, halakhic conversions; these definitions of, a Jew date back to the codification of the Oral
Argonne National Laboratory
Argonne National Laboratory is a science and engineering research national laboratory operated by the University of Chicago Argonne LLC for the United States Department of Energy located in Lemont, outside Chicago. It is the largest national laboratory by scope in the Midwest. Argonne was formed to carry out Enrico Fermi's work on nuclear reactors as part of the Manhattan Project, it was designated as the first national laboratory in the United States on July 1, 1946. In the post-war era the lab focused on non-weapon related nuclear physics and building the first power-producing nuclear reactors, helping design the reactors used by the USA's nuclear navy, a wide variety of similar projects. In 1994 the lab's nuclear mission ended, today it maintains a broad portfolio in basic science research, energy storage and renewable energy, environmental sustainability and national security. UChicago Argonne, LLC, the operator of the laboratory, "brings together the expertise of the University of Chicago with Jacobs Engineering Group Inc."
Argonne is a part of the expanding Illinois Research Corridor. Argonne ran a smaller facility called Argonne National Laboratory-West in Idaho next to the Idaho National Engineering and Environmental Laboratory. In 2005, the two Idaho-based laboratories merged to become the Idaho National Laboratory. Argonne has five main areas of focus; these goals, as stated by the DOE in 2008, consist of: Conducting basic scientific research. Argonne began in 1942 as the "Metallurgical Laboratory" at the University of Chicago, which became part of the Manhattan Project; the Met Lab built Chicago Pile-1, the world's first nuclear reactor, under the stands of a University of Chicago sports stadium. Considered unsafe, in 1943, CP-1 was reconstructed as CP-2, in what is today known as Red Gate Woods but was the Argonne Forest of the Cook County Forest Preserve District near Palos Hills; the lab was named after the surrounding Argonne Forest, which in turn was named after the Forest of Argonne in France where U.
S. troops fought in World War I. Fermi's pile was going to be constructed in the Argonne forest, construction plans were set in motion, but a labor dispute brought the project to a halt. Since speed was paramount, the project was moved to the squash court under Stagg Field, the football field on the campus of the University of Chicago. Fermi told them that he was sure of his calculations, which said that it would not lead to a runaway reaction, which would have contaminated the city. Other activities were added to Argonne over the next five years. On July 1, 1946, the "Metallurgical Laboratory" was formally re-chartered as Argonne National Laboratory for "cooperative research in nucleonics." At the request of the U. S. Atomic Energy Commission, it began developing nuclear reactors for the nation's peaceful nuclear energy program. In the late 1940s and early 1950s, the laboratory moved to a larger location in unincorporated DuPage County and established a remote location in Idaho, called "Argonne-West," to conduct further nuclear research.
In quick succession, the laboratory designed and built Chicago Pile 3, the world's first heavy-water moderated reactor, the Experimental Breeder Reactor I, built in Idaho, which lit a string of four light bulbs with the world's first nuclear-generated electricity in 1951. A complete list of the reactors designed and, in most cases and operated by Argonne can be viewed in the, "Reactors Designed by Argonne" page; the knowledge gained from the Argonne experiments conducted with these reactors 1) formed the foundation for the designs of most of the commercial reactors used throughout the world for electric power generation and 2) inform the current evolving designs of liquid-metal reactors for future commercial power stations. Conducting classified research, the laboratory was secured; such alluring secrecy drew visitors both authorized—including King Leopold III of Belgium and Queen Frederica of Greece—and unauthorized. Shortly past 1 a.m. on February 6, 1951, Argonne guards discovered reporter Paul Harvey near the 10-foot perimeter fence, his coat tangled in the barbed wire.
Searching his car, guards found a prepared four-page broadcast detailing the saga of his unauthorized entrance into a classified "hot zone". He was brought before a federal grand jury on charges of conspiracy to obtain information on national security and transmit it to the public, but was not indicted. Not all nuclear technology went into developing reactors, however. While designing a scanner for reactor fuel elements in 1957, Argonne physicist William Nelson Beck put his own arm inside the scanner and obtained one of the first ultrasound images of the human body. Remote manipulators designed to handle radioactive materials laid the groundwork for more complex machines used to clean up contaminated areas, sealed laboratories or caves. In 1964, the "Janus" reactor opened to study the effects of neutron radiation on biological life, providing research for guidelines on safe exposure levels for workers at power plants and hospitals. Scientists at Argonne pioneered a technique to analyze the moon's surface using alpha radiation, which launched aboard the Surveyor 5 in 1967 and analyzed lunar samples from the Apollo 11 mission.
In addition to nuclear work, the laboratory maintained a