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Why is it important that people exercise in their senior years? We discuss what kinds of exercises seniors should do, and the long-term health benefits that can be gained from staying physically fit as we age.

Last May, an earthquake devastated southwest China, toppling buildings. The culprit, says earthquake engineer Elizabeth Hausler, was precast concrete slabs. Hausler is now on a mission in Sichuan to help people build homes that can withstand future earthquakes.

Tom Karlo can remember one of the first jobs he had as a student assistant with KPBS. Scrubbing toilets. “We had an apartment building on the edge of campus, and two rooms had all the production eq

A number of U.S. service members have fallen ill after returning home from the wars in Iraq and Afghanistan. Some believe their ailments are caused by exposure to toxic open-air burn pits located at military bases throughout the warzone. Journalist Matthew LaPlante discusses his three part series, "Sickened by Service," which ran this month in The Salt Lake Tribune.

The crackdown in Tibet has attracted the attention of human-rights activists. On Monday, the Olympic flame begins an 85,000-mile journey on its way to Beijing, site of the 2008 Olympics. Protesters plan to dog torch bearers along the way.

On the final day of the G-8 summit in Japan, leaders of eight developed and eight developing nations issued a joint statement. In it, they pledged to combat climate change and advance U.N. negotiations on global warming. However, it failed to convince those attending from emerging economies that the rich nations are doing enough.

Jordanian, Palestinian and Israeli mayors who live near the Jordan River are calling attention to a new campaign aimed at cleaning it up. It's part of a European effort to clean up the world's polluted rivers.

Greg Mortenson, author of Three Cups of Tea, joins us to tell the story of his dangerous and difficult quest to build schools in the wildest parts of Pakistan and Afghanistan.

Director Zack Snyder on the panel for Watchmen (Tony Weidinger)

Concern about Hurricane Dean overshadowed the summit in Quebec, as Mexican President Felipe Calderon left early to oversee relief efforts. The war on terrorism was among other topics at the meeting of President Bush, Canadian Prime Minister Stephen Harper and Calderon.