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A field of unharvested wheat is seen in Ashby-de-la-Zouch, England, in 2012. Wheat wasn't cultivated in Britain until some 6,000 years ago, but DNA evidence suggests early Britons were eating the grain at least 8,000 years ago. Darren Staples/Reuters/Landov hide caption

itoggle caption Darren Staples/Reuters/Landov

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Colorado educators take part in a concealed carry course in Englewood, Colo. on Nov. 8, open to all state school employees. Participants who complete the training are eligible to apply for a permit to carry a handgun. MATTHEW STAVER/Landov hide caption

itoggle caption MATTHEW STAVER/Landov
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