Fluorine dating history

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Significant evidence of early humans in the British Isles had not yet been found, and the success of the Sussex dig was a major headline-grabber. None of them showed the large brain and ape-like jaw of Piltdown Man; instead, they suggested that jaws and teeth became human-like before a large brain evolved. At that time, fluorine testing revealed that the remains were a good deal younger than had previously been claimed, closer to 50, than , years old. Later, carbon-dating technology showed that the skull was actually no more than years old.
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Fluorine and Fluorination Chemistry

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It is used to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the Hajj. In almost all countries where the predominant religion is Islam, the civil calendar is the Gregorian calendar , with Syriac month-names used in the Levant and Mesopotamia Iraq , Syria , Jordan , Lebanon and Palestine. Notable exceptions to this rule are Iran and Afghanistan, which use the Solar Hijri calendar. Rents, wages and similar regular commitments are generally paid by the civil calendar. For central Arabia, especially Mecca , there is a lack of epigraphical evidence but details are found in the writings of Muslim authors of the Abbasid era.
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History of fluorine

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon , neon , and helium. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance. Fluorite , the primary mineral source of fluorine which gave the element its name, was first described in ; as it was added to metal ores to lower their melting points for smelting , the Latin verb fluo meaning "flow" gave the mineral its name.
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Piltdown man, whose fossils were sufficiently convincing to generate a scholarly controversy lasting more than 40 years, was one of the most successful hoaxes in the history of science. In a series of discoveries in —12, Charles Dawson, an English lawyer and amateur geologist, found what appeared to be the fossilized fragments of a cranium, a jawbone, and other specimens in a gravel formation at Barkham Manor on Piltdown Common near Lewes in Sussex. Woodward claimed that the fossils represented a previously unknown species of extinct hominin Eoanthropus dawsoni that could be the missing evolutionary link between apes and early humans. His claims were eagerly and uncritically endorsed by some prominent English scientists, perhaps because the Piltdown fossils suggested that the British Isles had been an important site of early human evolution.
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