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TIL in 1974 the CIA mounted a top-secret research project, "Azorian", to recover a Soviet nuclear missile submarine that had sunk in 1968 using a grapple secretly lowered from underwater, ultimately recovering about a 3rd of the submarine and two nuclear missiles from a depth of over three miles.

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Y7grZ TIL After his Apollo moon landing, Charlie Duke experienced marriage troubles. Duke and his wife underwent a religious conversion, leading to their creationist belief that everything in the universe was created by a God
NX4AP TIL Concrete is the second-most consumed substance on Earth behind only water. Thirty-three billion tons of it are used each year, making it by far the most abundant human-made material in history
Ne46 TIL Your brain accounts for only 2 percent of your body weight but consumes roughly 20 percent of your calorie intake. Average newborn’s brain uses close to 75 percent of available energy.
v1KYD TIL that Teddy Roosevelt would regularly go skinny dipping in the Potomac. Once while out on a walk with Gifford Pinchot and the French Ambassador, the three jumped in, however the French Ambassador kept on his gloves. When asked why, he responded, “We might meet ladies."
MeMeV TIL the Gemini 3 was named Molly Brown in the hope that it wouldn't sink at splashdown. NASA didn't like this and asked astronaut Gus Grissom to change the name, to which he replied "how about the Titanic?". NASA relented, but this was the last time astronauts were allowed to name their capsule.