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TIL that Emperor Xuan of Han spent his early years being raised in a prison

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GDON TIL the mercury everyone is so scared of in vaccines (thimerosal) is actually ethylmercury, while the toxic mercury which can damage the nervous system is methylmercury. The same way that we drink ethylalcohol (ethanol) but methylalcohol (methanol) will cause you to go blind, or just plain kill you.
kOW5E TIL that the earliest explosion ever detected is a Gamma-ray burst from 13 billion years ago. At this point in time the universe was only 6% of its current age. It is likely to be an explosion of an early star. The light of this burst passed the earth in 2005.
JYDB4 TIL you would need to eat about 200 apple seeds, or about 20 whole apples to kill yourself.
R7j7w TIL that while bronze is usually made from copper and tin, it can be made with copper and arsenic instead
9w8dm TIL that Dan Synder, owner of the Washington Commanders, illegally cleared old-growth national park forest from behind his home in 2004. The unobstructed view of the Potomac River is estimated to have raised the value of his own property $500,000 – $1,000,000. He was fined $1000.