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TIL that in fall when some tree leaves change color, the brown-red-yellow is actually their real color. The green was the chlorophyll used to absorb sunlight that is now broken down and reabsorbed into the trunk to save energy and reuse for next year's new leaves

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Dr4P TIL the computer mouse, video conferencing, teleconferencing, hypertext, word processing, hypermedia, object addressing and dynamic file linking, bootstrapping, and a collaborative real-time editor were all demonstrated for the first time in what is the called the “mother of all demos” back in 1968
mPmO TIL The Lord of the Rings film series has won 247 awards, and was nominated for a staggering 453.
V9x4 TIL that Alan Turing, the man who broke the enigma code during WWII, is estimated to have shortened the war by over two years, and to have saved over 14 million lives. He was later charged for his homosexuality and was forced to undergo chemical castration.
YYNr TIL in 2013 The Wall Street Journal discovered a cache of files that revealed the U.S. government lobotomized over 2000 veterans against their will after WW2. The veterans were lobotomized for reasons such as PTSD, depression, schizophrenia, and occasionally homosexuality.
Y7vxP TIL Section 746 of the 2010 US Dodd–Frank Act, prohibiting securities trading based on non-public info misappropriated from a government source, is called the "Eddie Murphy Rule." The term comes from the 1984 film Trading Places, where characters used insider info to short-sell frozen orange juice.