Social networking sites have been at the vanguard of the Arab uprisings over the past year. Egyptians used online pages to organize protests, and Syrian activists have posted frequent YouTube videos showing government forces shelling civilian areas.
Scientists estimate a more than 60 percent chance of a major earthquake hitting the San Francisco Bay Area within 30 years. Marwan Nader, lead design engineer for the new eastern span of the Bay Bridge, discusses features that give the bridge the flexibility to withstand the 'Big One.'
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