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TIL that the “Cheerleader Effect” (people look more attractive when they’re in a group than when they’re alone) coined by Barney Stinson in the TV Show ‘How I Met Your Mother’ has been the subject of a scientific study which confirmed the theory.

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X0veD TIL that Pokémon Gold and Pokémon Silver, which sold 23 million copies, were developed by just 4 programmers.
4keeX TIL that, the first Lockheed U-2 spy plane pilots, during extended flights, wore suits equipped with an indwelling urinary catheter. This tube, inserted through the penis into the bladder, siphoned urine into a bag. This suite and solution was unpopular among pilots
kJlLd TIL of the given name "Increase." It is the English language literal translation of the name Joseph. Since the 19th century, the name has decreased in popularity and is now rare, if not extinct.
mxOXP Today I learned that US universities protected students from the draft during the Vietnam war by awarding higher grades. It's believed that this kicked off grade inflation in the 60s.
Kea9 TIL bridges can be made from the roots of living trees. These Root Bridges takes at least 15 years to build, but is automatically strengthened over time and can last centuries.