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TIL that babies as early as 18 months cannot be fooled into believing something that causes pain results in pleasure. Adults often try to shield infants from distress by putting on a happy face following a negative experience. But babies know the truth.

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OGO6a TIL that a tiny songbird called the Northern Wheatear (weighing only about 25 grams) migrates nearly 29,000 kilometers round trip each year, from Alaska to sub-Saharan Africa and back, making one of the longest known migrations relative to body size of any songbird
nMaW TIL that giant rats actually existed within the confines of human history and were almost exactly the same size as the Princess Bride’s ROUS’s.
78kvx TIL that contrary to popular belief, the "petrified bodies" from Pompeii are not actually bodies at all; they are actually plaster casts that have been made by filling the empty space left by decomposed remains that deteriorated in the ash. Over 100 casts have been made since 1863
8a0wP TIL The first email attachment ever sent was on March 11, 1992, by Nathaniel Borenstein, "the father of the file attachment". The creation of this technology (co-created by Ned Freed) was to fulfill Borenstein's desire to one day be able to receive pictures of future grandchildren via email.
kPVg TIL Mark Zuckerberg is not the world’s youngest billionaire. Rather, it is his former college roommate, Dustin Moskovitz, who is a mere 8 days younger and also made his fortune in Facebook.