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TIL astronomers created fake stars to improve earth's telescopes view of real stars.

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JYMdj TIL that knowing something "By Heart" actually means to have a complete understanding of something before you commit it to memory, not that you have something completely memorized.
xJg1 TIL: Twisted Sister did 3,000 club perfomances and sold out the Palladium theater in NYC all without a recording contract or radio airplay. No one in the biz would touch them. TS ended up pressing their own albums and before finally getting a deal with a small UK punk label.
rW71 TIL that scientists have developed a way to get oxygen into the blood without the lungs.
ne6vW TIL Pakistan started a Billion Tree Tsunami project 2 years ago, to plant 1 billion trees all over the country within 5 years. Today, they witnessed 70% increase in honey production.
WkpON TIL Chiropractic was founded by a traveling religious miracle healer who belived that magnets could cure diseases. He was sent to jail in Iowa in 1906 for practicing medicine without a license. The American Medical Association later labelled chiropractors an "unscientific cult."