NPR's Alex Chadwick talks with photographer and explorer David Coulson about his adventures in the Sahara, discovering and preserving rock art, an ancient form of painting and engraving on stone. (6:09
Millions of drivers across the country are encountering speed cameras for the first time, or will soon. Many don't like it, but advocates say there's clear evidence that cameras make roads safer.
NPR's Danielle Kurtzleben speaks with Kevin Book of ClearView Energy about the United States' dwindling oil reserves as they hit the lowest level seen in more than four decades.