Template:Selected anniversaries/December 12
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Mathematician John Pell born. He will expand the scope of algebra in the theory of equations.
1862: USS Cairo sinks on the Yazoo River, becoming the first armored ship to be sunk by an electrically detonated mine.
1994: Diagram of public-key cryptography generation sell for 1.7 million dollars.
2007: Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.