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TIL Flashlight fish, casting a vibrant blue glow as they swim, owe their bioluminescence to the bacteria that grow in an organ underneath their eyes. It's a symbiotic relationship that allows the bacteria to obtain extra oxygen needed to survive.

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l0x1 TIL that India is credited with being one of the first civilizations to inoculate their children in times of pestilence to boost immunity and stop the spread of disease (1,000 years ago). They made a small incision into the child’s arm, then rubbed it with Smallpox scabs and a thin cloth.
OBM1 TIL that in 2005, a live grenade was thrown at George W. Bush by a terrorist in Georgia, but failed to detonate due to the handkerchief it was wrapped in. The grenade landed 18.6 metres from the President, well within its optimum killing range.
n0Er TIL that hungry men find women with higher body weights more attractive, according to a scientific study
gMyaD TIL about Arlington House, which was owned by Robert E. Lee and Mary Custis Lee, the step-great-granddaughter of George Washington. It was seized and later returned by the government. Lee’s son then sold it to the government. Its grounds are now the site of Arlington National Cemetery.
e0D6b TIL Emperor Marcus Aurelius, the man who ruled the Roman Empire at its apex and considered the best Roman Emperor ever lived for this reason, didn't want to rule, he had a "fear" of imperial power and was reluctant when the senate offered him the position of Emperor.