Template:Selected anniversaries/September 13
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1873: Mathematician and author Constantin Carathéodory born. He will pioneere the axiomatic formulation of thermodynamics along a purely geometrical approach.
1898: Priest and inventor Hannibal Goodwin patents celluloid photographic film.
2014: Army research laboratories convert modern plowshares into ancient swords. Military contractors call technique "Astonishing breakthrough."