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TIL about 7% of the people who have ever lived are alive today

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MeXEK TIL that during the Cold War, playground equipment in the US and the USSR was made with the intent of getting children to be interested in the Space Race
xVYL0 TIL in 2009 Astronaut and lunar explorer Buzz Aldrin teamed up with rapper Snoop Dogg to release a song celebrating the 40th anniversary of the Apollo 11 mission
wLRYP TIL that in 1965, California City, located in the mojave desert, was designed to be a metropolis built to rival Los Angeles. But lack of funds caused the city to never be built. The city currently has a population of around 15,000, and has a size of 125 square miles.
R5ax1 TIL Blue eyes do not contain blue pigments. The color comes from structural color, there are small particles suspended within the fibrovasular structure of the stroma that cause blue light to scatter. This is an example of the Tyndall effect.
AlyB TIL: Thomas Jefferson studied the Koran and argued that Muslims (as well as Catholics and Jews) should have equal rights in America