Public Safety 101: How California Earthquakes Work

November 9, 2011 | NASA's educational film The Earthquake Below contrasts vibrant scenes from San Francisco in 1975 with dramatic footage of the 1971 San Fernando earthquake More

Courtesy of: NASA, Internet Archive

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Where America's Unsafe Bridges Are Where America's Unsafe Bridges Are
In 1994, The Atlantic reported that nearly 20 percent of the country's bridges were "structurally deficient." Read more ›

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