Science and technology

Associated Press
In this photo from Thursday, May 24, 2012, a man and woman walk in the parking lot at Ocean Beach in San Francisco. In San Francisco, officials are mulling a significant retreat on its western flank, where the Great Highway is under assault from the Pacific Ocean. Right now, a beach parking lot that abuts the highway is crumbing into the sea just across the highway from the San Francisco Zoo. (AP Photo/Jeff Chiu)

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