In what country was the man who originally proposed Le Sage's theory of gravitation in 1690 born?
Nicolas Fatio de Duillier Nicolas Fatio de Duillier {'1': ", '2': ", '3': ", '4': "} (also spelled Faccio or Facio; 16 February 1664 – 12 May 1753) was a Swiss-born mathematician, natural philosopher, and inventor. He spent much of his adult life in England and Holland. Fatio is known for his work on the zodiacal light problem in astronomy, for originating the "push" or "shadow" theory of gravitation, for his close association with both Christiaan Huygens and Isaac Newton, and for his role in the Newton v. Leibniz calculus controversy. He also invented and developed the first method for fabricating jewel bearings for mechanical watches and clocks.
Charles-Georges Le Roy Charles-Georges Le Roy or Leroy (22 July 1723, Paris – 11 November 1789, Paris) was a French man of letters during the Age of Enlightenment and the author of one of the first books on human behavior.