Template:Are You Sure/April 3

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• ... that chemist and physicist Sir William Crookes (17 June 1832 – 4 April 1919) was a pioneer of vacuum tube technology, and that he invented the Crookes tube?

• ... that mathematician Jacques Ozanam (16 June 1640 – 3 April 1718) said "It is the business of the Sorbonne to discuss, of the Pope to decide, and of a mathematician to go straight to heaven in a perpendicular line"?

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