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TIL a water sommelier is a profession you can pursue once certified by the German Mineral Water Trade Company. Martin Riese is the only certified water sommelier in the US, but Europe has several.

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Wk9N4 TIL that during WW2, Bicycle (card company) smuggled escape maps in their card decks to help allied POWS escape from German POW camps. To reveal the map, a card was soaked in water as to separate the two paper layers that make up the cards. The map was on the insides of the card.
Ar7x TIL that if fraud were a country, it’d have the fifth largest economy in the world.
PYOkL TIL that Helen Keller was an radical activist, campaigning for the Socialist Party and helping start the ACLU.
wLvjM TIL That the chips (fries) British tourists eat in the Canary Islands are grown in the UK and exported there because Canary Islands' production can't cope with demand.
nWm4G TIL that termites - like mammalian ruminants - produce a lot of methane through their digestion process, but bacteria living in their nests filter and absorb a lot of it.