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TIL During World War II, The United States Playing Card Company created a very special deck of cards known as the “Map Deck.” When soaked in water, these decks could be peeled apart to reveal hidden maps that allowed escaping prisoners to find their way to safety.

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v1PZL TIL that in a 1986 poll during the AIDS crisis by the LA Times, 50 percent of adults surveyed supported a quarantine of AIDS patients, 48 percent would approve of identity cards for those who test positive for antibodies causes AIDS and 15 percent favored tattooing AIDS victims.
KYw6Q TIL that Charles V, Holy Roman Emperor had an extramarital sexual relationship with his own step-grandmother, Germaine de Foix, who was one of his many mistresses. Charles later married his first cousin, Isabella of Portugal. His sister, Eleanor, married Isabella's father and her uncle, King Manuel.
ADLmd TIL the Wii U actually didn't have that bad a launch, despite overall sales figures. In fact, on Dec. 31st, 2012, Nintendo announced that it had sold 3.06 million units worldwide with 11.69 million software units sold.
W7aA TIL that soy sauce activates the neurons of a dead squid causing it to “dance”, and this is a Japanese dish called odori-don.
9YRWB TIL that snails leave behind dotted trails. I discovered this after observing a snail on my back porch which left its trail. After researching it; it turns out they lift up their bodies when they move. Slugs are the ones that leave lines.