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TIL If you trace back the DNA in the maternally inherited mitochondria within our cells, all humans have a theoretical common ancestor. A woman, known as “mitochondrial Eve”. All humans today can trace their mitochondrial DNA back to her.

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nWnQb TIL that “heat lightning” is a misnomer. It is simply lightning from distant thunderstorms. Lightning can be seen up to 100 miles away in the right conditions, while the sound of thunder doesn’t travel nearly as far.
Wk5m9 TIL of the Casio VL-1, which combines a keyboard, a synthesiser, and a calculator. Despite its cheap and unorthodox construction, it became popular among musicians across many genres, from the German band Trio in their 1982 song "Da da da" to C418 in the Minecraft OST.
DQ9vp TIL that the Pacific Ocean is the largest and deepest ocean (average depth: 4,280m (14,040ft)), covering approximately 32% of the Earth's surface and about 46% of its water surface. Its area is around 165 million km² (63.8 million square miles), which is larger than all landmasses combined
Bxdy TIL that Jackie Chan, working as a nightclub bouncer, once spent two days after a fight trying to push his bone back into his fist. He later found that it wasn’t his bone… it was the other guy’s tooth.
J1Lg4 TIL that stonefish is the most venomous known fish in the world and stings can cause death if not treated. Some Indigenous Australians have corroborees which involve re-enacting the death of someone who trod on the fish.