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TIL The flag of Bikini Atoll closely resembles the USA. It is a symbolic reminder of islanders' belief that a debt is owed by USA to their people, because the US government detonated the Castle Bravo hydrogen bomb on the island in 1954.

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p8N1e TIL the quirks in the French numerical system ("four-twenty-ten-nine") are a legacy of the base 20 numerical system used by the Celtics. The hybridization with the base 10 system came with the Roman conquest of the Gaul.
ERlX TIL the name ‘Tank’ for armoured vehicles originated as a code word describing the vehicles as water carriers (or water tanks), to confuse enemy spies and keep their creation hidden. Water carries wasn’t used as this would have been abbreviated to W.C, another name for toilets.
wLWR1 TIL Robert De Niro was originally cast in the lead role in Big, a movie where a child is turned into an adult, before he dropped out and was replaced by Tom Hanks
Mag7 TIL there is a solar power method that doesn’t involve solar panels, but rather a giant curved mirror focusing all of the light that hits it onto a single point of intersection. A water reservoir is placed where the beams of light intersect, and the resulting steam runs a generator.
QJy1X TIL that there is a security system designed in South Africa to protect against the abundance of carjackers. The security system is just an under mounted flamethrower that the driver can use to light potential thieves on fire. It is completely legal in South Africa.