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TIL 3M invented the chemical PFOS back in 1950, used it in many products such as Teflon, Scotchgard, food warppers, etc., but it is now deemed to be toxic and the substance is now found in blood of animals everywhere from polar bears to dolphins to eagles.

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78NEL TIL the annual Minneapolis Aquatennial Festival happens every year near the end of July, a timeframe chosen by sponsoring businesses in 1940 to deliberately conflict with Teamsters' annual celebration of union victory in the violent truckers strikes of 1934-35
epVjE TIL: honeycombs start out circular, and the surface tension of the beeswax pulls them into hexagons as it solidifies, because it is the most energetically favorable conformation.
9wB7Q TIL of Eduard Bloch, Hitler’s family physician that was Jewish. He billed the family at a reduced cost and sometimes refused to bill them when Hitler’s mother was dying of breast cancer. Years later, Hitler gave Bloch special protection and allowed him to emigrate to the United States.
GAlRQ TIL the light we see from The Sun is technically more than 8 minutes old. Technically, because some stars are so far away and light only travels so fast, we are seeing light that is millions/billions of years old.
KYGW9 TIL scientists at Australia’s most famous radio telescope were baffled by signal bursts coming from the direction of distant galaxies for 17 years before they were eventually traced back to someone at the facility opening the door of a microwave oven while it was still running, causing interference