For the past 10 days, firefighters in California have been struggling to contain the Rim Fire, now one of the largest in the state's history, as it blazes across the Stanislaus National Forest and into Yosemite National Park. As of last night, the Rim Fire had burned nearly 240 square miles, disrupted hydroelectric power supply to San Francisco, and destroyed 23 structures. The fire is only 15 percent contained and still threatens thousands of homes in the mountainous region.