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TIL that a 500 page book contains only 0.53 calories

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by59 TIL the scent given off by each person’s unique immune system is the second-most important criteria (after disposition) women use to assess potential partners. Women are more likely to find people attractive who have with immune systems unlike their own.
RoZ7 TIL the number of syllables per line in the lyrics of “Lateralus” by Tool correspond to an arrangement of the Fibonacci numbers.
BrWgK TIL There's a neurological disorder called "Alice in Wonderland" syndrome. This affects patients' perception in a way that they may suddenly feel that they have become giants or the room around them has shrunk. It most commonly affects children.
4XaNN TIL Disney uses code names in the park. Rude visitors are called 'Treasured Guests.' Vomit is called 'Protein Spill.' Kids peeing in the pool is called 'Code Winnie.' Illegally spreading ashes is called 'White Powder Alert.'
woZvM TIL Fireflies produce light in special organs in their abdomens by combining a chemical called luciferin, enzymes called luciferases, oxygen and the fuel for cellular work, ATP. Entomologists think they control their flashing by regulating how much oxygen goes to their light-producing organs.