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TIL NASA Uploads an astronomy picture of the day everyday since June 16 1995. Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Read more apod.nasa.gov

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oRAxA TIL in 499 century BC, king Histaiaeus (ancient Greece) sent secret military messages tattooed on bald heads of messengers. After the hair regrew, they sent the messengers. In the destination they were shaved again to reveal the message.
Q096 TIL after getting lost in the desert a man tried to kill himself by slitting his wrists, he was so dehydrated his blood clotted the wounds. 9 days later he was rescued 186 miles (299km) away and had lost 40lbs (18kg) living off his urine, bats and snakes.
pY8DG TIL that John Harvey Kellogg, the inventor of Corn Flakes, was an early proponent of germ theory.
OGLJR TIL The firm who repaired seat covers on San Francisco's BART trains started paying people to slash the fabric, eventually accounting for 85% of vandalism reports
Y7DKA TIL if Jazz was invented in New Orleans, Ground Zero was Congo Square, a gathering spot for enslaved Africans enjoying their mandated day off a week as early as 1803 to drum, dance, sing and trade, leading eventually to Mardi Gras Indian traditions, the Second line, jazz, and rhythm and blues.