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TIL approximately 73% of the mass of the visible universe is in the form of hydrogen. Helium makes up about 25% of the mass, and everything else represents only 2%. Most of the atoms in our bodies and Earth are a part of this small portion of the matter of the universe

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ram4 TIL El Duce, member of shock-rock band the Mentors, passed a polygraph test after telling sources Courtney Love offered him money to kill Kurt Cobain. Later, he claimed to know who committed the murder; he was found dead two days later. (More links inside)
OKbe TIL that nannies would masturbate their children to put them to sleep up until the seventeenth century.
kZNe TIL Wearing red-tinted glasses before you go out into low light will help train your eye to focus better
b9ON0 TIL The dizziness and blurred vision (feeling of fainting) caused by suddenly standing up after a long time is called Orthostatic Hypotension. Because of gravity, your blood will fall to your lower body which causes your Thorax (chest area) and head to temporarily lose 700ml of blood.
OoZL4 TIL that in 2007, the hijacking of a Mauritanian flight was thwarted. Over the PA, the pilot instructed the passengers that he was about to make a bumpy landing, and they should attack the hijacker while he was off balance. He said this in French, which the gunman did not speak. The ploy succeeded.