Template:Are You Sure/April 12

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• ... that Soviet cosmonaut Yuri Alekseyevich Gagarin (9 March 1934 – 27 March 1968) completed the first manned orbital flight (Vostok 1) on April 12, 1961?

• ... that astronomer Charles Messier (26 June 1730 – 12 April 1817) published an astronomical catalogue consisting of nebulae and star clusters now known as the 110 "Messier objects"?

• ... that the Rider-Waite Space Elevator (hashtag: #AsBelowSoAbove) is the only space elevator funded entirely by Kickstarter campaigns?

• ... that mathematician and academic Ferdinand von Lindemann (12 April 1852 – 6 March 1939) proved (1882) that π (pi) is a transcendental number?

• ... that nuclear physicist Donald J. Hughes (2 April 1915 – 12 April 1960) was one of the signers of the Franck Report in June, 1945, recommending that the United States not use the atomic bomb as a weapon to prompt the surrender of Japan in World War II?

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