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Tamara Keith and Amy Walter on O'Rourke's campaign kickoff

Tamara Keith and Amy Walter on O'Rourke's campaign kickoff

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7:39
News Wrap: Streetcar shooting in the Netherlands kills 3

News Wrap: Streetcar shooting in the Netherlands kills 3

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6:59
How social media reacted to video of New Zealand shootings

How social media reacted to video of New Zealand shootings

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6:38
Boeing 737 MAX incidents spark safety approval questions

Boeing 737 MAX incidents spark safety approval questions

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6:05
With 'angry' weekend Twitter storm, Trump took on GM, McCain

With 'angry' weekend Twitter storm, Trump took on GM, McCain

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5:20
As caliphate collapses, new ISIS threats emerge in Syria

As caliphate collapses, new ISIS threats emerge in Syria

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2:16
Cyclone leaves Mozambique desperate and submerged

Cyclone leaves Mozambique desperate and submerged

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2:27
A former U.S. ambassador on the state of American diplomacy

A former U.S. ambassador on the state of American diplomacy

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7:32
A survivor tells of horror at an Assad government prison

A survivor tells of horror at an Assad government prison

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9:25
News Wrap: Midwest fears additional flooding from snowmelt

News Wrap: Midwest fears additional flooding from snowmelt

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4:58
How Trump and Bolsonaro align, personally and politically

How Trump and Bolsonaro align, personally and politically

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4:17
HUD's Ben Carson on public housing and political 'spin'

HUD's Ben Carson on public housing and political 'spin'

Video
9:33
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PBS News Hour

Uncovering the history of Earth’s climate

To understand the history of climate change, researchers are digging underneath the ocean floor where organisms and plants have accumulated in sediment over millennia. Maureen Raymo studies this science of paleoclimatology using a vast collection of materials at Columbia University’s Lamont-Doherty Earth Observatory. NewsHour Weekend's Hari Sreenivasan reports.
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