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TIL that horses' hoof keep growing long if not trimmed/cut
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BryNe
TIL that all printers use yellow ink to print an identifiable and traceable code on everything they print; that way if someone tries to counterfeit money, send threatening letters, etc it can be proven to have come from their printer.
7rRQx
TIL the soft soil that causes the Leaning Tower of Piza to tilt has protected it from at least 4 strong earthquakes.
wLJQo
TIL A future Chief Scientist of the U.S. Air Force decided to become an aviation engineer when as a boy was catching sweets from the American planes during the Berlin Airlift. Dr. Yarymovych worked also for NASA on Apollo program and is credited with initiation of GPS
Zd5Q
TIL there is a forest in Germany that had trees planted in the shape of a swastika. The swastika is only visible during the spring and fall of each year. It went unnoticed until 1992.
wLW16
TIL the NFL hosted the "Playoff Bowl" from 1960-1969 for determining third place in the league between the two teams that did not make the NFL Championship game.