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TIL of the fish kick, a technique in swimming where the swimmer turns sideways and mimics the motion of an eel. It is arguably the fastest way to swim and was once famously used in the 2000 Olympics by Misty Hyman to win the 200m butterfly. However, this kick is rarely used owing to its difficulty.

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OGnRe TIL that giraffes used to be called "camelopards", because medieval Europeans once believed them to be mythical hybrid creatures that were born from the union of a leopard and a camel. As such, giraffes are still called "camelopards" in European heraldry.
64DQ TIL there is a waterfall called The Devil’s Kettle, a mystery to scientists because the western half of the water flows into a pothole. However, every attempt to trace the path of this half of the river once the water has gone into the pothole has failed.
D1WKg TIL a light bulb in Livermore, California has burned continuously for over 117 years. Conspiracy theorists see it as a symbol of planned obsolescence, but its longevity can be attributed to its extremely inefficient design.
XEeyQ TIL Coke was sued for the "unwarranted health claims" on their product Vitamin water. Coke's defense was "no consumer could reasonably be misled into thinking vitamin water was a healthy beverage."
698w7 TIL In 2011 the 7'2" WNBA center Margo Dydek died after suffering a massive heart attack at the age of 37. She was pregnant with her third child. She had retired after playing 11 seasons.