5/6/1635 Johann Becher , alchemist, phlogiston theory, he thought he could make himself invisible, he died in 1682 at age 47.
5/6/1856 Sigmund Freud, psychiatrist, founded psychoanalytic method of psychiatry, he died in 1939 at age 83.
5/6/1856 Robert Peary, explorer, claimed to be the first person to reach the geographic North Pole, it is still in doubt today, he died in 1920 at age 63.
5/6/1871 Victor Grignard, chemist, formulated the Grignard Synthesis to couple carbon atoms in organic molecules, he died in 1935 at age 64
5/6/1872 William Sitter, astronomer, questioned Einstein’s theory of a curved universe, he died in 1934 at age 62