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TIL that leaf cutter ants do not eat leaves. They feed the leaves to a fungi within their nest and then feed off the fungi. This is an example of Mutualism, which is a type of Symbiosis.

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Jy81 TIL a volcanologist died at an observation camp when Mount St. Helens exploded in 1980. He had agreed, for one day, to fill in for a colleague who was rotating out a third scientist based at the camp. The man rotated out died 11 years later during the Mount Unzen (Japan) eruption.
wpE7 TIL that not only is Manny Pacquiao one of the most successful boxers of all time–winning eight world titles in as many weight classes–he is also a politician, basketball coach, actor, and a retired singer.
Z8OAa TIL Sergei Rachmaninoff's greatest hit is 1975's "All By Myself," in which Eric Carmen unknowingly included copyright protected melody structure from Rachmaninoff's 2nd Piano Concerto, thinking it was public domain. It wasn't, having been originally published in 1901.
WlgY TIL that nearly 8% of Asian men are descended from Genghis Khan. That’s nearly 350 million men with one common ancestor.
VKy8 TIL Jim Lahey ( John Dunsworth ) is Sarah’s (Sarah Dunsworth ) father in real life