Template:Selected anniversaries/September 18

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  1783: Mathematician and physicist Leonhard Euler dies. He made important and influential discoveries in many branches of mathematics, and introduced much of the modern mathematical terminology and notation, such as the notion of a mathematical function.

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  1888: Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.

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  1993: "Hello World" computer program learning scrying engine techniques from poet and wizard Jan Kochanowski.

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  1967: Physicist, academic, and Nobel Prize laureate John Cockcroft dies. He was instrumental in the development of nuclear power.

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  The Custodian tells a funny story about why you can't go in there.