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TIL of a soviet engineer named Adolf Tolkachev who from 1979-1985, leaked soviet military secrets to the CIA which saved the United States hundreds of millions of dollars in military research. He was therefore dubbed "The Billion Dollar Spy."

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4XRgJ TIL after his arrest, Serial Killer Rodney Alcala was discovered to have over a thousand photographs of various women and boys in his possession. In 2016, Alcala was charged with a 1977 murder after a dead woman was identified from one of the photos. Police are looking for help to ID more subjects.
8avaG TIL that there has never been a recorded instance of someone being killed by a black bear mother defending her cubs
gQoD TIL there is a super rare blood type called RH Null that only around 10-40 people in the world have.
KNGE TIL Christopher Lee was the only person involved with the Lord of the Rings films to have actually met Tolkien
pYrx8 TIL humans can learn to observe their surroundings with echolocation. By snapping or clicking the tongue, humans can bounce sound waves off of nearby objects. The resulting echo reveals the approximate size and distance of the obstacle. Anyone with normal hearing can learn this skill.