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TIL there is a massive subterranean biosphere estimated to contain life approaching double the volume of all oceans. About 70% of Earth's bacteria and archaea live here. These microbes are often very different from surface cousins, with life cycles on near-geologic timescales.

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KYwpB TIL whiskers can spontaneously grow from tin and several other metals, sometimes causing catastrophic damage within electrical circuits. NASA has a team dedicated to investigating this risk, but the fundamental cause of “whiskering” has still not been discovered.
eEbJ TIL “Rebellion to Tyrants is Obedience to God” was Benjamin Franklin’s suggested motto for the Great Seal of the U.S.
W7R09 TIL Birds aren't actually blue, but appear to be due to an optical illusion caused by light interacting with the 3D structure of their feathers.
PGZ TIL Immortal Technique donated all the money he made on his last album to build an orphanage in Afghanistan.
j6A9X TIL The U-505 was known for being one of the most unlucky subs in the Kriegsmarine. She was the most damaged sub to return from a mission, repeatedly sabotaged by the French Resistance, had the only commanding officer suicide during combat, and failed to scuttle so was captured by the Americans.