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TIL that an invention called the Radiovota would have essentially allowed 1930’s radio listeners to up-/downvote broadcasts.

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v1NY4 TIL a retired American heart and lung surgeon has patented a scuba suit that would allow a human to breathe “liquid air”, like in the movie The Abyss. He has simulated 1000 foot dives with mammals and has decompressed them in less than half a second with no decompression sickness.
mxl9x TIL that Japan has blue traffic lights in some areas because historically the Japanese used the same word for green and blue.
ADeNn TIL that theoretically the smallest object in the universe is called a Preon. Inside of an atom is the nucleus, inside that are 3 quarks. And inside a quark is theorized to be something called Preons. They are so small that as of now, they haven't even been physically observed.
rRD9y TIL that Boxing star Tommy Morrison at the age of 13 got a fake ID and started fighting in “tough man” competitions in which you needed to be 21 to enter. He only lost one of those fights.
eNy6 TIL: 30 million facebook users are dead…