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TIL that September from 1752 had only 19 days

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7r16M TIL that the Australian island state of Tasmania has an 85-metre land border with Victoria due to a surveying error
m1nLR TIL 1816 was the "Year Without a Summer," due to very low temperatures. People believed the Sun was about to extinguish as large Sunspots were visible on it's surface, spreading doomsday panic. In actuality, the cause was due to Mt Tambora, the largest volcanic eruption in human history.
l7nYG [TIL] Tigers, Lions, and other big cats don't have slitted pupils like house cats, but round pupils like us.
9w81m TIL that the Eurotunnel between England and France has trains that are basically roads on wheels, allowing passengers to walk in between cars and busses in a fully enclosed space.
Lklvd TIL NASA calculated that you only need 40 digits of Pi to calculate the circumference of the observable universe, to the accuracy of 1 hydrogen atom