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TIL that the reason tigers are orange is because their prey see them as green. Deer, which are the main prey of tigers, are only capable of seeing blue and green light, which effectively renders them color-blind to red. Therefore, to deer, the tigers are seen as green.

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wo8nW TIL of Gabe Sonnier, a man who started off as a janitor in a Louisiana elementary school until one day in 1985, when he was inspired by the then-principal to take up teaching. Gabe was 39 years old when he started studying for a teaching degree. He’s now the principal of that elementary school.
xYZ1 TIL: During WW2, there was an Edinburgh derby (in soccer/football) that was so foggy, neither the commentator or the spectators knew what was going on. The commentator couldn’t mention the fog, incase Germans were listening. He described a fake game but under the fog it ended 6-5.
EXPP TIL That a 6 year study of the D.A.R.E. program showed that a “small but significant number” of suburban students were more likely to use drugs after participating in it than those who didn’t.
b9nOp TIL Thomas Jefferson's epitaph, which he wrote himself, states "Here was buried Thomas Jefferson Author of the Declaration of American Independence Of the Statute of Virginia for religious freedom & Father of the University of Virginia." It makes no mention of his Presidency.
E1700 TIL that many of the props used in the 2009 film ‘District 9’ were reused from a planned Halo movie that fell through.