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 cured a plague at the Sicilian city of Selinus and claimed he was a god.
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 Reformation, the Renaissance, and the scientific period of the 17th century can hardly be contemplated without printed books.
Nicholas Copernicus - Polish astronomer; regarded the founder of modern astronomy. He studied mathematics and optics at Cracow, then canon law at Bologna, before becoming canon of Frombork.Epicurus - Greek philosopher; founded the system known as Epicureanism.