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Trevithick, one of the five Americans set free by Iran in January, joins Hari Sreenivasan.
The federal goverment has enlisted college students to counter extremism.
Jad Abumrad says he grew up in a kind of in-between space, as an Arab kid in Nashville.
Miles O'Brien joins Jeffrey Brown to discuss how the disaster changed space travel.
Lisa Desjardins talks with Judy Woodruff about Donald Trump’s debate dropout.
Oklahoma experienced sharp increases in earthquakes, some geologists blame on fracking.
Ethanol took center stage in Iowa last week,
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