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TIL that while interbreeding occurred between neanderthals and early modern humans, the only genetic evidence of these events conserved within the human genome comes from Y chromosomal DNA meaning that all neanderthal DNA within modern humans comes from male neanderthal and female human pairings.

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7rnAp TIL there are gloves that teach untrained musicians to play the piano in an hour. While wearing, the gloves vibrate in ways that stimulate certain movements to condition a user's hand for a specific task. These vibrations help the brain soak up knowledge even if the wearer isn't paying attention.
9Ygm7 TIL that although canvas is usually made of cotton or linen today, historically it was made from hemp. This explains its similarity to the word cannabis.
8a4Q4 TIL that not a single centipede has exactly 100 legs. This is because centipedes always have an odd number of body segments, which would be 50 in the case of a 100 legs.
OGavg TIL the very first phone call was between the head of Motorola to his rival at Bell Laboratories to brag, "Joel, this is Marty. I'm calling you from a cellphone, a real, handheld, portable cellphone."
Lkn40 TIL that cheetahs are very anxious animals when in captivity, which affects their ability to breed. To help with this, zoos give the anxious cheetahs emotional support dogs to help keep them calm and relaxed.