This week's broadcast, hosted by Jane Pauley, features David Pogue's cover story on the problems of plastic waste. Also: Erin Moriarty reports on the increase in deaths in the U.S. of women during childbirth; Faith Salie looks at the pioneering work of artist Dox Thrash; Barry Petersen visits Great Sand Dunes National Park and Preserve in Colorado, where sandboarding enthusiasts take to the slopes; Tracy Smith gets serious with late-night host Jimmy Kimmel; and John Blackstone finds out what makes a champion truffle-hunting dog.