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TIL in 1963 biologist and animal psychologist James McConnell conditioned planarian flatworms to fear a bright light by electrocuting them. He would then grind up those flatworms and feed them to other worms who had not participated in the experiment. Those worms were afraid of the light.

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epw9n TIL The Ancient Romans had a goddess for fever whom they worshipped for protection against malaria
vP4kL TIL of the 'Sicarii', a group of Jewish zealots who are regarded as one of the earliest known organized assassination units of cloak and daggers, predating the Order of Assassins and Japanese ninja by centuries.
ADx17 TIL of Antonio Paoli, a Puerto Rican tenor considered one of the most outstanding opera singers of all time. During WWI, when all opera houses closed, he lost his voice and became a profession boxer (5-1), retiring after breaking his wrist. He retrained and gained his voice back after the war.
1a44P TIL that a man in Idaho went on vacation, and returned to find that a bear broke into his condo through a second story door, ate food, and defecated on his carpet. He closed the door to keep the bear away, but the bear then tried to enter through the cat door, only managing to poke its head in
W0QL TIL that if you earn more than $25,000 annually, you’re in the top 10% of the world’s income earners. If you earn more than $50,000 a year, you’re in the top 1% of the world’s income earners.