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TIL in 2014 a Chinese company built 10 one-story homes in 24 hours using 3D printing technology. Each 2,100 square-foot building costs less than $5,000 to construct. The builder hopes the company’s 3D-printing technology will one day be used to build skyscrapers.

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xVgv5 TIL As president, Herbert Hoover became the first chief executive to harness federal power to combat a crippling global recession. Hoover reformed America’s prisons, improved worker safety, and fought for better health for children
Y766P TIL the typical loss on reselling a diamond is between 25% and 50% of its original purchase price, and even less as a percentage of appraisal value.
D1pbp TIL new Converse Chuck Taylor All-Star sneakers are fuzzy on the sole, because this allows them to be taxed as slippers. Slippers have a much lower import tariff than shoes (in the USA.)
7rabO TIL that some rainbows have only one color and it is called a "Monochrome rainbow".
18Lr TIL the U.S. Army illegally performed “psychological operations” to manipulate American senators into providing more troops and war funding – and when an officer tried to stop the operation, he was railroaded by military investigators.