American teacher of physics and mathematic regarded as the "Father of Cryonics" because of his book The Prospect of Immortality.
Robert Ettinger was born on 4 December, 1918
Today's Events: 20 April
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Apollo 16 lands on the moon
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First human organ replacement
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Vitaphone process – add sound to film – announced
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Radium chloride refined by Marie and Pierre Curie
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Secchi disk demonstrated
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Theory of spontaneous generation proven false
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Rare Sun Dog phenomenon observed in Stockholm
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David Filo Birthday
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Slavoljub Eduard Penkala Birthday
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Fred Fish Death Anniversary
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Kathleen Antonelli Death Anniversary
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Rudolph Dirks Death Anniversary
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Giuseppe Peano Death Anniversary
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Karl Ferdinand Braun Death Anniversary
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Bram Stoker Death Anniversary
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Chauncey Jerome Death Anniversary