Science and technology

Associated Press
A member of a security team helps guard an area of rubble from a destroyed residential neighborhood, one day after a tornado moved through Moore, Okla., Tuesday, May 21, 2013. The huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against the winds. (AP Photo/Brennan Linsley)

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