Associated Press
Exhibits illuminate the central corridor of the Exploratorium, an interactive science and activities museum, during a preview in San Francisco, Tuesday, April 9, 2013. The new $300 million museum is set to open April 17 at its new location along the bay with more space and new exhibits. The 330,000-square-foot museum at Pier 15 along the Embarcadero has three times more space than the previous location at the Palace of Fine Arts in the city's Marina neighborhood. (AP Photo/Eric Risberg)

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