Richard Wrangham, author of Catching Fire: How Cooking Made Us Human, and professor of biological anthropology at Harvard University, discusses how our shift from raw to cooked foods was the key factor in human evolution.

This Saturday, Portlanders will be gathering in Pioneer Courthouse Square to convince other Oregonians that 350 is a very important number. That's the maximum safe level of parts per million of carbon dioxide in the atmosphere. The 350 movement, initiated by author-activist Bill McKibbon, is having actions in over 140 nations this Saturday to pressure governments to take serious action to curb climate change. In the United States, the call to action comes as the U.S.