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This NASA Scientist Helps Prevent Mars from Contamination
The spacecraft has to be extremely clean. The entire spacecraft—that includes the rover, the heat shield, the descent stage, and back shell—must contain less than 500,000 bacterial endospores, or spores. Just to give you an idea, a teaspoon of seawater has ten times more bacteria.
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53:25
Follow Homo sapiens as they venture out of Africa and spread farther than any other human species.
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53:32
Trace the remarkable origin story of Homo sapiens and the crucial moments that shaped our species.
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53:27
Forensic science is put to the test after the first-ever staged multi-vehicle pileup.
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53:29
A first-of-its-kind experiment aims to stage a multi-vehicle pileup to gain new data on car safety.
1:36:42
After centuries of pseudoscience, researchers examine the causes of racial health disparities.
53:41
Follow scientists in a quest to understand how complex forest ecosystems can help cool our planet.
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53:39
Explore key military technologies in the American colonies’ fight for freedom.
53:32
Follow the investigation into the deadly container ship collision that closed the Port of Baltimore.
53:40
Archaeologists uncover new truths about Pompeii, a wealthy Roman playground with dark secrets.
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53:40
A long-lost ancient cemetery opens the door to a unique period in Egyptian history.
53:35
Fossils reveal how birds survived the killer asteroid and became today’s only living dinosaurs.
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53:40
Follow the race to build a world-class airport on the site of one of America’s busiest flying hubs.