Posted by Events
1994 – Confirmation of the first extrasolar planets (around pulsar PSR B1257+12) is announced by Alexander Wolszczan.
Births
1652 – Michel Rolle, French mathematician
1774 – Jean-Baptiste Biot, French physicist
1882 – Percy Williams Bridgman, American physicist, Nobel laureate
1889 – Paul Karrer, Swiss chemist, Nobel laureate
1951 – Michael Hartley Freedman, American mathematician
Deaths
1557 – Petrus Apianus, German mathematician
1719 – Philippe de la Hire, French mathematician and historian
1825 – Johann Friedrich Pfaff, German mathematician
1965 – Edward Victor Appleton, English physicist, Nobel Prize laureate
1980 – Aleksandr Oparin, Russian biochemist
April 21, 2007