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TIL The most popular type of oranges in the world is called Navel Oranges. They originate from a tree which mutated 200 years ago in Brazil and they are seedless, because the tree is seedless it cannot propagate normally and all navel orange trees are born from cuttings rather than seeds.

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a8O4N TIL of Helias Doundoulakis, the man who patented the suspension system for the Arecibo telescope, was a spy for the United States Office of Strategic Services (OSS) during WW2.
V48G TIL of “fagging”, a practice in British private schools where younger students were required to act as personal servants to senior students (the fag-masters). Sexual abuse was rampant in this system.
0dvDM TIL 2 Native American guides were killed for food during the Donner Party catastrophe
wLJD8 TIL to be "anal retentive" originally referred to someone who took pleasure in retaining their feces
9Yxv7 TIL In 2012 a scientific study predicted a 39 inch rise in sea level along the North Carolina coast over the next century. In response, North Carolina lawmakers passed a law banning the use of scientific predictions of sea level rise when considering new developments along the coast.