CT scans and new DNA technology indicate that a bone sharpened into a spear was used to kill a mastodon in the northwestern U.S. 13,800 years ago. The research revisits an old debate about the evidence for an early hunt in North America.
The Kinder Morgan deal will likely make the company the largest natural gas pipeline operator in North America. This comes at a time when more people in the U.S. are becoming reliant on the fuel. For more, Robert Siegel speaks with Daniel Yergin, chairman of IHS Cambridge Energy Associates and author of The Quest: Energy, Security, and the Remaking of the Modern World.