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TIL ecologists once thought Beaver dam-building was an amazing feat of planning, indicative of the high intellect. This was tested when a recording of running water was played in a field near a beaver pond. Although on dry land, the beaver covered the tape player with branches and mud.

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9Qd6 TIL Edward Pena, one of the trapped Chilean miners finished a marathon after training everyday while trapped in the mine for 69 days
VBo9G TIL about the Triangle Shirtwaist Factory fire, which was a devastating event in American history. On March 25, 1911, a fire broke out at the Triangle Shirtwaist Factory in New York City, which employed mostly young immigrant women in the garment industry.
e0wJb TIL the Aquatic Ape Theory suggests that early hominids lived in water part of the time and accounts for our hairless bodies (streamlined for swimming) our upright, two-legged walking (made wading easier) & our layers of subcutaneous fat, which made us better insulated in water (think whale blubber)
e0w16 TIL: The 2012 Olympic Committee asked Music Manager Bill Curbishley to have drummer for "The Who" Keith Moon perform the opening ceremonies. Curbishley replied "If they have a round table, some glasses and candles, we might contact him." Keith Moon had been dead for 34 years.
b6yGa TIL that Tenji blocks, also known as tactile pavement, were invented in 1967 by Seiichi Miyake to help a friend who was losing their vision. This pavement is now used around the world.