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Happy birthday to 17th-century polymath Athanasius Kircher! Read about his subterranean adventures here: https://t.co/mCX3eoEo7Z #OTD
April 15, 1452: Italian polymath Leonardo da Vinci was born in Vinci, Tuscany. #OTD
Robert Hooke, English natural philosopher, architect and polymath (author of 'Micrographia') died #OnThisDay in 1703.