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Asteroid: Doomsday or Payday? Preview
The asteroid that exploded over Siberia—injuring more than 1,000 and damaging buildings in six cities—was a shocking reminder that Earth is a target in a cosmic shooting range. From the width of a football field to the size of a small city, these space rocks have the potential to be killers. In a collision with Earth, they could set off deadly blast waves, raging fires and colossal tidal waves.
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See how ingenuity and teamwork keep the crew alive and doing science 250 miles above Earth.
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Astronauts and Mission Control relive terrifying moments during construction of the ISS.
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Find out why deadly flash floods are on the rise and how we can protect ourselves from them.
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Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.
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Discover how two revolutionary ancient inventions changed the course of humanity forever.
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Discover how Homo sapiens outlasted Neanderthals – and how they helped make us who we are today.
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53:25
Follow Homo sapiens as they venture out of Africa and spread farther than any other human species.