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TIL that the Moon emits a constant tail of sodium. When small meteorites hit the surface of the Moon, the sodium from the dust that is emitted is picked up by the solar wind and blown away in a specific direction.

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LAxZ TIL: Firefighters would hide in Ground Zero rubble so that dogs could find “survivors”. Constantly finding bodies was leading to high stress in the dogs as they thought they were failing.
jgEv TIL In 1965, a Ukrainian farmer dug up the lower jawbone of a mammoth. Further excavations revealed the presence of 4 huts, made up of a total of 149 mammoth bones. These dwellings, dating back some 15,000 years, were determined to have been some of the oldest shelters ever built.
OGeNX TIL Harvested Mushrooms Placed in Sunlight or Under a UV Lamp Produce Vitamin D2 in 15 Minutes!
1abr TIL when the U.S. invaded Mexico the Irish fought alongside Mexico untill the last battle, when they ran out of ammo, tore down the white flag, and continued fighting with bayonets until 85 were captured and put to torturous deaths by the U.S. Today it is known as the largest hanging in N. America.
WagB TIL of Chen Si: A Chinese man who since 2003 has dedicated every weekend to patrolling the Nanjing Bridge to help those about to commit suicide. He is credited with stopping over 300 suicides.