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TIL that sled dogs can run without getting tired because their bodies can directly burn fat and protein for energy whereas other animals need carbs to do so.

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XyLD TIL that curly hair is curly because the hair follicle it grows from is oval and straight hair is straight because the hair follicle it grows from is round. Straight hair is like a straw (except tinier) and curly hair is like a slightly squeezed tip of a straw.
X0kkP TIL the original Ferris Wheel was designed and constructed by George Washington Gale Ferris Jr. as a landmark for the 1893 World's Columbian Exposition in Chicago. It was intended to rival the Eiffel Tower, which was the centerpiece of the 1889 Paris Exposition.
Xn1r TIL that life has existed on Earth for over 80% of its existence, and was present from nearly the moment the Earth cooled.
rR0ne TIL The light pen, a predecessor to modern touch screens, was first invented in 1955 and popular through the 60s and 80s. A light pen detects changes in brightness from the cathode-ray tube and communicates the timing of this event, time and brightness are correlated for position.
yn7X TIL the guy that ran against Hitler in the German Presidential Election of 1932 was arrested 1 year later, thrown into solitary confinement until 1944, and then shot on Hitlers order.