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TIL in 1972, diver Bret Gilliam survived a 325+ ft ascent, with an empty oxygen tank, after trying to save a colleague from attacking sharks.

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9wpLM TIL about the long-standing Memphis Mayoral Candidate, Prince Mongo, who claims to have been born on the planet Zambodia around 333 years ago
Bggr TIL the Galileo mission may have accidentally triggered a nuclear explosion on Jupiter
R7L5Q TIL Scientists think Neptune has an ocean of slushy ice that's almost as hot as the sun. [Scientific link provided, but images of how I actually learned in the comments]
JYEBV TIL that in Singapore, all newly developed public housing estates (HDB) must have a green plot ratio of 4.5. That means the total "leaf area" of plants and trees must cover at least 4.5 times the area of the development site itself.
xKpo TIL a prize of one million dollars has been offered to anyone who can demonstrate that $7,000 audio cables are any better than ordinary cables