1638 - Frederik Ruysch, Dutch physician and anatomist
1749 - Pierre Simon de Laplace, French mathematician and astronomer
1754 - Baron Jurij Vega, Slovenian mathematician, physicist, and artillery officer
1769 - William Smith, English cartographer (see above) and "Father of…
1923 - Insulin first became generally available for use by diabetics.
1452 - Leonardo da Vinci, Italian Renaissance polymath (above)
1552 - Pietro Cataldi, Italian mathematician
1641 - Robert Sibbald, Scottish physician
1707 - Leonhard Euler, Swiss mathematician
1710 - William…
1895 - While experimenting with electricity Wilhelm RÃ¶ntgen discovers X-rays.
1656 (N.S.) - Edmond Halley, British astronomer and mathematician
1854 - Johannes Rydberg, Swedish physicist
1885 - Hans Cloos, German geologist
1922 - Christiaan Barnard, South African heart surgeon
1970 - Explorer 1 re-enters the Earth's atmosphere (after 12 years in orbit).
1994 - Bill Kimbel, Don Johanson and Yoel Rak report the finding in Ethiopia of the first fairly complete Australopithecus afarensis skull (AL 444-2, see above)
1596 - RenÃ© Descartes, French…