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A journey to Valhalla, Oregon’s hidden canyon

A journey to Valhalla, Oregon’s hidden canyon

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3:53
Republicans take aim at rivals as Democrats ready for debate

Republicans take aim at rivals as Democrats ready for debate

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7:14
With peace on the horizon, Colombia’s president asks for aid

With peace on the horizon, Colombia’s president asks for aid

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13:05
Amid death’s throes, young doctor examines life for meaning

Amid death’s throes, young doctor examines life for meaning

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7:39
Why this writer chronicles uncompromising black artists

Why this writer chronicles uncompromising black artists

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2:58
What to watch for in the New Hampshire Republican debate

What to watch for in the New Hampshire Republican debate

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2:56
Turkey pressured to open border as thousands of Syrians flee

Turkey pressured to open border as thousands of Syrians flee

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4:11
Delegate math means a rocky road to the GOP nomination

Delegate math means a rocky road to the GOP nomination

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10:15
Has the U.S. motto become ‘In Nothing We Trust’?

Has the U.S. motto become ‘In Nothing We Trust’?

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4:34
A look inside the Atlantic's first 'underwater museum'

A look inside the Atlantic's first 'underwater museum'

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4:09
The hidden psychology behind sports teams and their fans

The hidden psychology behind sports teams and their fans

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5:44
Syrian refugees share stories of survival in Lebanon

Syrian refugees share stories of survival in Lebanon

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7:44
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PBS News Hour

Three-parent DNA treatment for rare defect raises debate

When women have defective mitochondria, their children can inherit terrible, sometimes fatal problems. A new technology, pioneered in England, adds healthy cellular structure from a third person, meaning that children are born with DNA from three people. William Brangham learns more from Jeffrey Kahn of Johns Hopkins University and Marcy Darnovsky of the Center for Genetics and Society.
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