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TIL narwhals and beluga whales can mate to produce a hybrid called the Narluga

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jDeR TIL That Optical tweezers exist and are capable of holding single molecules for study
P1K8L TIL that it costs more than 2.5 cents to produce a penny and more than 10 cents to produce a nickel
p8mLA TIL in WWII, Italian doctors made up a disease to save Jews from the Nazis. "Syndrome K" was said to be a deadly, highly contagious, disfiguring disease and the doctors saved at least 20 Jews by quarantining them.
gMLoA TIL in the Movie Django unchained, Leonardo Di Caprio bled for real in the scene where he smashes his hand on the table and this was unscripted
Eggjo TIL Astronomers measure sunspot areas using a square grid by placing the grid over the photo of a sunspot and count the number of squares covering it. Areas can also be determined using graphical charts and software