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.
A discussion about the potential for a nuclear or radiation attack on the U.S. and what can be done to prevent or protect against such an attack.
- Ronald Sagdeev professor of physics at the University of Maryland
- Thomas Graham president of the Lawyers' Alliance for World Security
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