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