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Application of isotopes in carbon dating

Between 14 he was in Strasbourg, probably working as a goldsmith, and here he may have begun printing.

Democritus of Abdera - Greek philosopher; pupil of Leucippus; developed atomic theory; elaborated idea that matter consisted of atoms having physical size and shape which constantly moved in a void and interacted in different ways; Greek word atoma means indivisible.His theory that the earth exerted a magnetic influence throughout the solar system was a precursor to the modern conception of gravity as an attracting force between masses.Gilbert was among the first to divide substances into electrics (spar, glass, amber) and nonelectrics.The treatise was translated into English in 1912 by future U. president Herbert Hoover and his wife, Lou Henry Hoover. He became a devoted follower of Erasmus, who wrote a foreward to Agricola's first book on mining and metallurgy (1930).While town physician of Joachimsthal (now Jachymov, Czech Republic), he became intensely interested in all aspects of the mining and metallurgy industry by which the town thrived and began a 25-year study of the subject, which culminated in hos posthumously published masterpiece.Preoccupied with change, he declared that fire is the central element of the universe, and he postulated a world with no beginning and no end...

Pythagoras - Greek philosopher and mathematician; held that numbers were basic to matter; the Pythagorean Theorem is named for his geometric formulation; developed atomic theory; students of his philosophy emphasized geometrical form as a basic property of atoms; developed mathematical relationships which led to musical harmony.

William Gilbert - Some say (1544-1603) - English physician; known for his early studies on electricity and magnetism.

His De magnete (1600) propounded the theory that the earth was a giant lodestone with north and south magnetic poles.

He also played an importqant role in the development of the Western or Sicilian school of Greek medicine.

He cured a plague at the Sicilian city of Selinus and claimed he was a god.

The 12-chapter treatise included 292 woodcult illustrations carfully executed by Blasius Weffring.