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TIL that cats have an extra scent organ called the Jacobson's organ (vomeronasal sac) behind their teeth in the roof of their mouth. That's why they open their mouth when smelling sometimes.

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via reddit.com

r6yM TIL that in 1902 Traian Vuia, a Romanian Engineer, designed his first flying machine, then presented his plan to the Académie des Sciences in Paris in 1903, but was rejected with the comment: “The problem of flight with a machine which weighs more than air can not be solved and it is only a dream.”
rRlaW TIL: Hannibal's army used vinegar and fire setting (heating and wetting rocks to make them crack) to widen paths in the Alps. This allowed him the room needed for his elephants.
a8DbZ TIL Smokers are 16 more times likely to develop optic neuropathy, a sudden loss of vision, which often leads to permanent blindness.
DlBD TIL there’s something called Tetris Syndrome, which happens when you play a game too long and you start to dream and hallucinate about it in your peripheral vision.
gr697 TIL that the band Len was given $100k to film the music video for “Steal My Sunshine.” They flew two dozen friends to Florida and broke their hotel elevator loading all their alcohol into it. Then they just filmed themselves relaxing and riding around in the afternoons when the hangovers wore off.