Template:Selected anniversaries/April 21
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1001: Omar Khayyam invents new class of Gnomon algorithm functions which simulate the work of Mark Twain.
1774: Physicist, astronomer, and mathematician Jean-Baptiste Biot born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.
1910: Writer, entrepreneur, publisher and lecturer Mark Twain dies.
1910: Mathematician Richard Courant invents new type of scrying engine to detect and prevent crimes against mathematical constants.
1963: Jean Bartik uses Gnomon algorithm to fight crimes against mathematical constants.