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TIL dragonflies don’t need their heads to breathe, and so they can survive headless until they starve to death.

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WkdP8 TIL that 88 million pounds (40,000 metric tons) of cosmic dust rain down on Earth each year, which is produced by collisions between asteroids and spewed from comets as they pass through the inner solar system. That's still a tiny amount though, as Earth is about 6,000 billion billion metric tons.
ne7Wo TIL that over 2,500,000 Indians volunteered to fight in World War 2, making it the largest all-volunteer army in history.
md9v TIL of ‘Tetris Effect’, where a person devoting a large amount of time to a particular pattern-based activity(which in this case is Tetris) will start unconsciously thinking and dreaming about it
8axKb TIL the tall cone-shaped “princess hat” is called a hennin. They originated with the warrior queens of Mongolia and became fashionable in Europe after Marco Polo brought one back from his travels.
R5k9Q TIL: The US National Anthem has 4 verses, but we only sing the first one