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TIL that the famous photo of Albert Einstein sticking out his tongue was taken on his 72nd birthday when he was asked by a photographer to smile for the camera. After smiling a dozen times for previous photos that day, he playfully stuck out his tongue instead.

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egJb TIL the co-founder of Southwest Airlines arm wrestled another CEO for rights to the slogan “Just Plane Smart”
9Y966 TIL Ancient Egyptian papyri and Sumerian tablets dating back to 2200 BC detail the medicinal role of wine, making it the world's oldest documented human-made medicine. Wine continued to play a major role in medicine until the early 20th century.
QNg5L TIL that Ireland was nicknamed Wolf-Land for its substantial population. Hundreds of wolf pelts used to be exported yearly, and English governments banned the export of wolfhounds in order to control the wild population.
WkeWA TIL that bees can't see red. What we perceive as the colour red is seen as black by bees. However, they can see ultraviolet. UV allows them to see vein like patterns in a flower, like a map which allows them to locate the nectar treasure.
VMM1D TIL that researchers who have studied Coulrophobia, the fear of clowns, believe there is some correlation to the uncanny valley effect, in which a figure is lifelike enough to be disturbing, but not realistic enough to be pleasant.