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No one knows for sure what dinosaurs looked like, so paleontologists pull inspiration from modern birds and reptiles to design true-to-life dinosaurs and artists make informed guesses based on these clues.

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VBm18 TIL A group of well trained athletes were given placebo steroids, and they showed the same results in 8 weeks as would be expected with a low dose of real steroids
BrXgk TIL in WWI, German, French, and British forces used fake, hollow trees to spy on their enemies' movement. To do this, combat artists would duplicate a bombed out tree nearby, and under the cover of darkness, engineers would uproot the original tree and replace it with the fake one.
Qlrd TIL on Feb 20th, 1792 George Washington signed the Postal Service Act, making it illegal for postal officials to open anyone’s mail.
loMj5 TIL there’s an official day of kindness in Pennsylvania that honors Mr. Rogers’ favorite number, 143, which stands for the letters in “I love you.“
WkAjA TIL in 1872 a Japanese samurai and politician Shinpei Eto established a wanted photograph distribution system. Its first subject was Shipei Eto himself. The circulation of wanted photographs aided his swift arrest. He was executed at the age of 41