Changing public attitudes have led to a decline in U.S. soda sales. But health expert Marion Nestle believes many people still consume unhealthy amounts of sugary drinks. She argues beverage companies are spending millions on research that misleads consumers.
Guest Host: Susan Page
A recently released study shows new evidence that Mars may have supported life at one time. Two scientists talk about recent findings in astrobiology, a discipline that brings together astronomy, biology, geology, genomics, ecology, chemistry, zoology, and paleontology.
- Baruch Blumberg director of the NASA Institute of Astrobiology
- Richard Berendzen professor of physics at American University
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