Noobink: TIL that during WWII, Bicycle playing cards were made so that, when submerged in water, they could be peeled apart to reveal parts of a map inside. When all put together, they were a larger map. These decks were given to POWs, so that if they escaped, they would have a map.

TIL that during WWII, Bicycle playing cards were made so that, when submerged in water, they could be peeled apart to reveal parts of a map inside. When all put together, they were a larger map. These decks were given to POWs, so that if they escaped, they would have a map.

http://en.m.wikipedia.org/wiki/Bicycle_Playing_Cards

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