Portal:History of science/Selected anniversaries/May 7

May 7: Radio Day
 * 1617 - Death of David Fabricius, German astronomer (b. 1564)
 * 1765 - Death of Alexis Clairault, mathematician (b. 1713)
 * 1847 - In Philadelphia, the American Medical Association (AMA) is founded.
 * 1895 - In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention: the radio receiver. It is known as Radio Day or Communications Workers' Day in Russia and Radio and Television Day in Bulgaria.
 * 1909 - Birth of Edwin H. Land, American inventor and founder of Polaroid (d. 1991)
 * 1939 - Birth of Sidney Altman, Canadian-born molecular biologist and Nobel Prize laureate
 * 1952 - The concept for the integrated circuit, the basis for all modern computers, is first published by Geoffrey Dummer.
 * 1998 - Death of Allan McLeod Cormack, South African-born physicist and Nobel Prize laureate (b. 1924)