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TIL sucking on your SO's (F) nipples can cause irregularities in periods and is also a method of (extremely unreliable) contraception. Sucking on the nipple releases the hormone prolactin, which causes the brain/body to think there is already an suckling infant and will try to delay the next.

Read more my.clevelandclinic.org

via reddit.com

KOrkw In 1965, a Japanese company called Yamasa Clock created a personal-fitness pedometer called the Manpo-kei, which means “10,000 steps meter.” The Japanese character for 10,000 looks almost like a person walking or running, which is likely how the gadget-maker landed on the name—and the number. It’s also an easy goal to remember, especially when accompanied by a sketch of a person who’s literally walking. But that benchmark wasn’t based on any scientific evidence. There's no magic number of steps that can ensure your heart health.
GVrN TIL that in the early 1900s oyster fishermen in Narragansett Bay tried to eliminate starfish that were preying on their oysters. Whenever they encountered starfish, they chopped them up with their knives and threw them back into the water. As a result, the sea star population increased explosively.
W7Bwd TIL that during the 2003 invasion of Iraq, Saddam’s forces never launched a single Scud at U.S. troops—thanks to swift coordination between U.S. intel, surveillance, and airpower that took out the launchers first.
e5Eg TIL Shredded documents can be put back together easily using computer software. Once scanned, an automated program then assigns a unique ID to each piece, and analyzes a number of characteristics, including size, color, indentation, and font using a matching algorithm.
pEPN TIL chemotherapy can cause your hair to grow back with a completely different texture and color.