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TIL Portland, OR was named after Portland, ME instead of Boston, MA based on the flip of a penny by two early residents

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DWkp TIL Sputnik (The first Soviet test flight into space) Landed in Manitowoc, Wisconsin. The town now holds a yearly sci-fi festival celebrating the event.
M70Kb TIL Finger binary allows a person to represent up to 32 on a single hand and up to 1023 using both hands. The middle finger represents the number 4.
6l9X TIL: all female placental mammals menstruate, but only female humans, bats, elephant shrews and some primate species bleed, which is called overt menstruation. Other mammals completely reabsorb the endometrium in what is known as covert or ‘true’ menstruation.
ALbg TIL During World War I, France posted parrots at the top of the Eiffel Tower to warn against incoming aircraft. With the potential to hear up to a 20 mile radius, the parrots would squawk if they detected planes within Paris’ airspace.
yQ0ka TIL that it's safer than ever to be a cop and the number of line‐of‐duty deaths has declined dramatically over the last five decades.