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TIL that a traditional Sardinian cheese, casu marzu, is eaten with live maggots in it. The maggots break down the cheese’s fats, making it exceptionally soft. Each cheese has thousands of maggots in it. The larvae can launch up to 15 cm, so diners hold their hands above the cheese to prevent this.

jNPoM TIL that the famous cover photo of The Beatles' album "HELP!", in which the four of them pose in flag semaphore to each make a letter, actually has them spelling "NUJV". The photographer said he thought it looked better.
ADG9g TIL about Exclusive and Inclusive Counting. In English-speaking countries Sunday is seven days from Sunday (Mon, Tue, Wed, etc.), we exclude the initial Sunday. In Romance languages Sunday is eight days from Sunday, the first Sunday is included in the counting.
YpW4Z TIL the Marshallese used map charts made of sticks to navigate the Marshall Islands in canoe. They displayed the major ocean swell patterns and how the islands disrupted them. The charts are only interpretable by their makers who would memorize them before their voyages. They were used up until WW2.
0LBj TIL in 1993 when a US Military food scientist was asked what should be used in the pictograph instructions to prop up the heater of their new “Meal, Ready-to-Eat” rations, he replied “I don’t know. Let’s make it a rock or something.” The rock illustration and the iconic phrase remain on MREs today.
aPWM TIL that an ‘I am Rich’ iPhone App was made which cost $999.99. The App displayed a glowing red gem on a user’s iPhone screen for the sole purpose of proving to onlookers that one is of the moneyed class. It was removed later, but not before eight people bought it.