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TIL the whistly/chirpy sound you hear when mourning doves take off and fly isn't a vocalization. The sound comes from specially shaped feathers on the wings. See video for examples

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yVoMp TIL that in 1946, Hungary issued the largest-denomination banknote ever, the 100 quintillion (10^20) pengő note. This was a result of the worst case of hyperinflation in history. One sextillion (10^21) pengő banknotes were printed as well but ultimately never issued.
lop5r TIL that JFK had his cabinet staff read "The Guns of August", a book about the start of WWI in August 1914, during the Cuban Missile Crisis in October 1963, saying "I am not going to follow a course which will allow anyone to write a comparable book about this time, "The Missiles of October."
xVMZw TIL from 1897-1907 the US Department of Labor commissioned several reports on the condition of Blacks in America, culminating in a damning report by W.E.B. Du Bois on the exploitation of Blacks in Alabama. Rather than publish the report, the DOL destroyed all copies and halted the studies.
wVeE TIL that children being born are the first in two centuries to have a lower life expectancy than their parents, and the cause of it is obesity
oR5Qr TIL When Rome fell into a grain shortage, M.Coriolanus suggested to weaponise the crisis and withhold aid from the starving plebs until some the recent pro popular reforms were rolled back. Following popular uproar the senate called him into a hearing, he refused to show up and was convicted