Science and technology

Associated Press
In this photo taken Tuesday, Dec. 23, 2014, a needle pops off a Douglas fir tree after a researcher brushed past it in a temperature and humidity-controlled room at a Washington State University research facility in Puyallup, Wash.  Consumers consistently cite messiness as one of the most common reasons they don’t have a real tree, says the National Christmas Tree Association. (AP Photo/Elaine Thompson)

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