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TIL Imperial Japan made were the first to develop intercontinental weapons capabilities by sending hydrogen balloons to deliver bombs to the U.S.

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dGR9 TIL The reason PINs are typically four digits is that the inventor’s wife could only remember four digits. Had she not mentioned this they would be six digits.
x69Xo TIL there are 16,000 acres of sand dunes in Alaska - Kobuk Valley National Park
EVm0 TIL that after arriving in Los Angeles at 19, a broke Charlize Theron tried to cash a check from her mother to pay for rent, but the teller refused. She got into a shouting match with him, drawing the attention of a talent agent behind her, who introduced her to casting agents and an acting school.
QNMO9 TIL many commonly used statistical methods, such as Student's t-test, were invented by the head brewer at Guiness Brewery for quality control
BlDy TIL that from 1808 to 1821, the capital of Portugal was moved to Rio de Janeiro, making it the only European country to have been ruled from its colonies.