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TIL For centuries the main source of metal to Greenland’s Inuits was from fragments of a 58-ton Iron Meteorite

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1aR8r TIL that just about 90 years ago, humans believed that there's only one galaxy (ours) that's surrounded by infinite dark space. Today we know there are at least 400 Billion galaxies, some visible to the naked eye.
9YjnM TIL about Tunnel Boom. Compression waves are generated in front of the high-speed train upon entering a tunnel. These compression waves subsequently coalesce into a weak shock wave so that a unpleasant sonic boom is emitted from the tunnel exit.
YpkkZ TIL that India once arrested a pigeon on suspicion of spying for Pakistan and held it under armed guard.
7rawL TIL the commonly-acknowledge health goal "10,000 steps a day" has no real medical merit other than walking is good for you and it's a well rounded number.
8aeLa TIL there is an aviation navigational fix named "INBRD". It is located over the rural town of Milton, FL.