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NOVA
Ancient Earth: Frozen Preview
700 million years ago, Earth was a giant snowball cloaked in ice from pole to pole. How did life manage to hold on through this deadly deep freeze, find creative ways to bounce back, and thrive in the dramatically different world that emerged?
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53:41
How has the land shaped our lives, from the arrival of the first Americans to today?
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How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?
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Experience the colossal geologic forces that shaped our continent over 3 billion years.
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Watch as the New Horizons spacecraft captures our first clear view of Pluto’s icy surface.
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53:10
Which technologies worked in the race to track down the men behind the marathon attack?
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52:53
Can science help us understand why some people commit horrific acts of mass murder?
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52:52
A team uncovers the advanced engineering behind an ancient Egyptian war machine.
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Is our universe unique, or could it be just one in an endless "multiverse"?
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Take a wild ride into the quantum realm, where even the impossible seems possible.
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It defines our lives, but what is time really? Have a look into its true nature.