(1683) French physicist, mathematician and astronomer Jean-Pierre Christin is born. He proposed the reversal of the Celsius thermometer scale, which was accepted and still used today.
(1852) German microbiologist Julius Petri is born. He is known for inventing the Petri dish, a dish used for many bacteria studies today.
(1941) American pharmacologist Louis Ignarro is born. In 1998, he shared the Nobel Prize in Physiology or Medicine for demonstrating the signalling properties of nitric oxide.
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