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TIL 18 and 19 year olds are technically teenagers

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OomYY TIL that Helen Keller learned how to talk through the work of her teacher, Anne Sullivan. Sullivan taught her by placing one of Anne’s fingers over Sullivan’s throat, one over her mouth, and one on her nose so that she could feel the vibrations of all the different letters and replicate them herself
PYJrg TIL Trees talk with each other using electronical impulses
5Ep TIL that Teddy Roosevelt was the first and only US president to take on a full grown cougar with only a knife.
0mRy TIL Stalin’s body double was teased in school because of the resemblance with Stalin
eppG6 TIL about Grave, a unit of measurement used in the first metric system and predecessor to the kilogram. It was defined as the mass as a cubic decimetre of distilled water at 0 °C.