June 6

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  1436: Mathematician, astronomer, and bishop Johann Regiomontanus born. His contributions will be instrumental in the development of Copernican heliocentrism in the decades following his death.

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  1844: The Glaciarium, the world's first mechanically frozen ice rink, opens in London.

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  1857: Mathematician and physicist Aleksandr Lyapunov born. Lyapunov will contribute to several fields, including differential equations, potential theory, dynamical systems and probability theory. His main preoccupations will be the stability of equilibria and the motion of mechanical systems, and the study of particles under the influence of gravity.

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  1943: Chemist and academic Richard Smalley born. Along with colleagues Robert Curl and Harold Kroto, he will win the 1996 Nobel Prize in Chemistry for the discovery of a new form of carbon, buckminsterfullerene, also known as buckyballs.

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  2017: In a press statement, Pin Man says he was "constructed by Colonel Zersetzung from the flayed skin of a notorious data thief."