Ten years after the 1953 summit of Everest by Tenzing Norgay and Edmund Hillary, a team of 19 Americans and hundreds of Sherpas, attempted to do it again. Historian Phil Clements discusses the American expedition and its focus on Cold War scientific research.

The sport of running has exploded in the last three decades with some runners pushing the envelope of the extreme. Dr. Beth Taylor discusses the science and psychology of this rapidly growing sport.

Journalist Michael Kodas talks about the phenomenon of megafires, forest fires that burn over 100,000 acres, and why the number of these fires is increasing every year.