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What is CRISPR gene editing?
Scientists have a new tool to edit genes in human cells to repair mutations. What is it?
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53:21
Follow engineers and woodworkers as they rebuild an iconic American covered bridge.

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Follow the harrowing operation to rescue 12 boys stranded in a flooded cave in Thailand.

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53:37
Explore Africa’s sleeping giant—Nyamuragira, one of the world’s most dangerous volcanoes.

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Climb into the crater of Nyiragongo, a seething and active African volcano.

1:53:20
Discover how Earth’s intricate climate system is changing.

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53:15
How courage and ingenuity saved Allied troops during the epic Dunkirk operation in 1940.

53:26
Take a mind-blowing voyage to the most powerful and mysterious objects in the universe.

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53:32
Watch as birds solve puzzles and challenge our basic notions of intelligence.

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54:10
Scientists uncover geologic evidence of epic floods that tore through ancient landscapes.

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53:11
Experts reconstruct the Great Hurricane of 1780 to help predict the risk of future storms.

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54:10
Scientists hunt for a mega-eruption that plunged medieval Earth into a deep freeze.