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Video thumbnail: PBS NewsHour New report suggests Earth on the brink of a great extinction

PBS NewsHour

New report suggests Earth on the brink of a great extinction

New report suggests Earth on the brink of a great extinction

New report suggests Earth on the brink of a great extinction

Video thumbnail: PBS NewsHour Washington weighs in on impact of the Bergdahl exchange

PBS NewsHour

Washington weighs in on impact of the Bergdahl exchange

Washington weighs in on impact of the Bergdahl exchange

Washington weighs in on impact of the Bergdahl exchange

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