A new report says traffic in the U.S. is worse than it's been in years. But some say there are reasons to be optimistic. For this month's Environmental Outlook: How revitalized urban centers and new modes of transportation are changing how we get around our cities.
Tennessee’s Bill Frist is the only U.S. Senator who is also a physician. He’s now an expert on bioterrorism preparedness and coping measures for other public health crises. Sen. Frist tells Diane what all Americans need to know about these threats.
- Sen. Bill Frist
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