› added 6 years ago

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TIL that during the grand opening of the great pyramid of Tenochtitlan in 1487 the Aztecs sacrificed 84,000 people in four days.

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6EjR7 TIL Dolphins sleep with one eye open and one eye closed. This is because only half of their brain is asleep at a time.
v1wrr TIL There are no green mammals.
0MpM TIL: Exactly 53 years ago today, the USA used a drugged black bear named “Yogi” to test the first fighter pilot ejection seat at supersonic speeds.
ykNp TIL The word “scientist” did not exist before 1833. Before this, scientists were referred to as “natural philosophers”.
4X5a5 TIL Arabic numerals (our numbers today) were first popularized in Europe by Fibonacci when he learned about them in Algeria.