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TIL of blindsight, where a cortically blind person can't consciously see but still has visual information subconsciously processed. Such a person may avoid an obstacle in their field of view but not know why they did so.

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r6Le TIL the largest naturally occurring iron mass on the Earth’s surface was discovered in 1920 on a small farm in rural Namibia. Unusual for its size (over 60 tonnes) it was found to be extraterrestrial in origin, proving to be the largest iron meteorites to ever reach the Earth’s surface intact
OGBxX TIL spiders do ballooning, whereby they release silk into the air that catches wind or electric fields, causing them to become airborne. Spiders have been documented to do ballooning up to 5 km in altitude, and to be able to travel hundreds of kilometers.
gMogD TIL in 1996, a Canadian man fled Canada and thought someone was out to kill him, took his money and drove to Knoxville, TN. He ended up dead in a parking lot with his money around his half-naked body. Police reports show the man was killed by a blow to the stomach. The case remains unsolved.
1aGJ8 TIL of Ben L. Salomon, a dentist in the Battle of Saipan whose field hospital was overrun by the Japanese. He provided cover fire for the wounded to escape and then manned a machine gun for additional cover fire. When his body was found, 98 dead enemy soldiers were piled in front of his position.
mxJJR TIL Bayer used slave labor and tested drugs on prisoners in Auschwitz