Science and technology

Associated Press
United States runner Sanya Richards-Ross speaks during a news conference at Olympic Park during the 2012 Summer Olympics, Monday, July 30, 2012, in London. Richards-Ross is one of the U.S. athletes who are part of a Twitter campaign demanding changes in Olympic Rule 40 — which, among other things, does not permit athletes "to promote any brand, product or service within a posting, blog or tweet or otherwise on any social media platforms or on any websites." (AP Photo/Matt Rourke)

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