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TIL an inventor trying to make a sock to prevent trench foot first produced modern water balloons. Having made a latex-coated sock and filling it with water to test for leaks, he found a rip and angrily threw it on his table. Pleased with the splash, he decided to market water balloons for children.

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R7DD8 TIL during the Apollo 11 lunar descent, Neil Armstrong, who was manually piloting the craft, heart rate was under 90bpm. After the Eagle touched down, it spiked to almost 160 bpm
9DMM TIL that the real reason the ocean is salty is because the entire volume of the ocean is going inside the earth into magma chambers and out, every 6-8 million years, where it exchanges minerals it got from rivers, and we did not know this until 1979.
R7DbQ TIL that the historically vague measurements "dash, pinch, smidgen" are mostly real cooking measurements that have generally agreed-upon amounts
LQoRv TIL British rock band The Who was at Shepperton Studios filming a music video and in the adjoining studio, They were shooting the egg room scene from the movie Alien. The Director borrowed the laser from the who to make the effect with the smoke and the laser over the top of the eggs.
7rPAb TIL of Yoñlu, a Brazilian singer-songwriter. After commiting suicide at the age of sixteen, his work was found in a CD-R by his parents, and was released posthumously, becoming rather successful within the independent scene. Now, he's getting a movie done on his life, also known as "Yoñlu".