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TIL WW2 pilots carried hollow metal spheres that would implode when they sunk to a certain depth, allowing their location to be triangulated from up to 3000 miles away.

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rRLDx TIL that Ted Jorgenson abandoned his son shortly after his birth. A reporter managed to find Ted, who owns a bike shop, and asked about his son. He had no clue who his son was, and upon refreshing his memory Ted asked if he's still alive. His son ended up being the richest man on earth, Jeff Bezos.
oRrQE TIL that Varina Davis, the First Lady of the Confederate States of America, was personally opposed to slavery and doubted the Confederacy could ever succeed. After her husband’s death, she moved to New York City and wrote that “the right side had won the Civil War.”
WVmo TIL That the German Shepherd was named Alsatian becuase it was thought the word German might harm the breed after the World Wars.
XEDAD TIL that people diagnosed with Alzheimer’s disease may lose the ability to smell peanut butter. The “Peanut Butter Test” may offer an early indication of the disease.
QJm1e TIL of Magawa, an African giant pouched rat who helped clear landmines left over from the Cambodian civil war from over 225,000 square metres of land. He was capable of sniffing out the TNT in explosives, and could work much faster than humans since he was too light to detonate the mines.