Historian Matthew Dallek looks at the history behind the Office of Civilian Defense, the country's first agency for homeland security, and the competing visions of those tasked with spearheading the department: New York City Mayor Fiorello La Guardia and First Lady Eleanor Roosevelt.
A panel of scientists talks about the possibility that multiple universes have been created in the same way as ours.
- Dr. Gordon Kane professor of physics at University of Michigan
- Dr. Andrei Linde professor of physics at Stanford University
- Dr. Raman Sundrum professor of physics at Johns Hopkins University
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The Democratic National Convention gets underway in Philadelphia, where Hillary Clinton will accept the presidential nomination.