Saccharin is accidentally discovered, the 22nd Amendment is ratified, Michael Jackson wins his first Grammy, and Mister Rogers dies, all on this day.
1936: Russian physiologist and Nobel Prize laureate Ivan Pavlov, known primarily for his work in classical conditioning, dies of double pneumonia at age 86 in Leningrad, Soviet Union. Pavlov is most famous for his concept of "conditioned reflex," discovered while examining the rates of salivations among dogs. Pavlov discovered that then when a buzzer, metronome, bell or other stimuli provided to a dog before food, the dog will initially salivate when the food is presented. The dog later came to associate the stimuli with the presentation of the food and salivated upon the presentation of just that stimulus.
Warner Bros. Television
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