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TIL of Sam Panopoulos, a Greek Canadian restaurateur who in 1962 at the Satellite restaurant in Chatham, Ontario, decided to put ham and pineapple on a pizza, aiming for something sweet and savory. He called it the Hawaiian pizza and his food invention has earned wrath and praise ever since.

9Yoop TIL psilocybin, the psychoactive chemical in magic mushrooms (psilocybin mushrooms), is being researched as a potential treatment for anxiety and depression in people with cancer diagnoses, for alcohol use disorder, and for migraines and cluster headaches.
d8av7 TIL: about the Transcontinental Airmail Route. A series of huge, bright yellow, illuminated, concrete arrows, built in the 1920s. They were every 10 miles and followed to enable night flying. A lot of these concrete arrows, now cracked and aged, still exist across America.
VBOEZ TIL that, in 1972, several natural nuclear fission reactors were discovered in Oklo, Gabon. They worked around 1.8 to 1.7 billion years BP, continued for a few hundred thousand years, and produced around 100kW of thermal power
E1jXx TIL there is a constant, and wildly chaotic, vortex at the south pole of Venus. At the cloud tops, the wind speed can reach 400km/hour.
W7MgB TIL the King of Sweden's son who was Crown Prince of Sweden was demoted and the King's eldest child (a female) became heir apparent after a succession law was enacted in 1980 making Sweden the first recognized monarchy to adopt absolute primogeniture.