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TIL Beats headphones contain about $17 worth of parts and a full 1/3rd of their weight comes from metal weights

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XLQ6 TIL Ancient Romans believed eyelashes fell out from excessive sex and that long lashes indicated purity and chastity.
1aP8D TIL the Turkmenistan "Door to Hell" is a large crater in the Karakum desert, created by the collapse of a natural gas field. Engineers attempted to burn off the gas for the protection of local villagers, but instead, it has filled the cavern with flame for 50 years, with no end for the near future.
KOV54 TIL If you weighed 100 pounds at the north pole on a spring scale, at the equator you would weigh 99.65 pounds, or 5.5 ounces less. Your mass, in grams, would stay the same because 'grams' is a measure of the resistance of a body to being moved and has nothing to do with acceleration or gravity.
KOb5E TIL President Coolidge and his wife had a pet raccoon named Rebecca who lived with them in the White House. Rebecca was supposed to be eaten for 1926 Thanksgiving dinner, but they adopted her instead.
OoPK4 TIL: Craigslist has over $500 million annual revenue, nets about $100 mil, has a (now) billionaire founder, and only charges for ads in 6 cities.