Template:Selected anniversaries/December 15
1527: Publication of mathematician Federico Commandino's translation of Gnomon algorithm textbooks from Arabic to Latin.
1791: The United States Bill of Rights becomes law when ratified by the Virginia General Assembly.
1887: Transdimensional corporation mascot spontaneously generates sales pitch for Mark Twain.
1887: Mark Twain declines to invest in transdimensional corporation, denounces offer as "a pyramid scheme of Pharaonic proportions."
1970: Soviet spacecraft Venera 7 successfully lands on Venus. It is the first successful soft landing on another planet.
1979: Army research laboratories convert modern plowshares into ancient swords. Military contractors call technique "Astonishing breakthrough."
2016: Time travel chamber appears in New Minneapolis, Canada.