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TIL of 1920s ‘Little Albert experiment.’ Johns Hopkins University chose a nine-month old infant from a hospital and attempted to ‘condition a phobia in an emotionally stable child.’ They successfully made him fear Santa, rabbits, and other furry animals.

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5VXNQ TIL The juice of red cabbage can be used as a homemade pH indicator
y1M8 TIL that honey bees ejaculate so forcefully that their penises explode. This kills the honey bee.
ANp0B TIL According to space law Weapons of mass destruction are prohibited in space and Moon and other celestial bodies can only be used exclusively for peaceful purposes.
vgoK TIL that Sherlock Holmes was based, in part, on a medical professor of Sir Arthur Conan Doyle called “Bill”. Bill would look at his patients without their speaking, determine their ethnicity, profession, and make a prediction about their condition based on sight alone.
b90e9 TIL TVs emit a tone during ad breaks that are inaudible to humans but that smartphones are listening for; now corporate entities can link the tv & phone as belonging to the same person. It means govt entities can play a tone thru the TV & ping all the phones in the room, identifying the whole group.