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NOVA
A Hidden Cause of Sinkholes Is Lurking Underground
Sinkholes can form either really quickly, or really slowly over a long period of time – and they don’t always come with warning signs.
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53:41
How has the land shaped our lives, from the arrival of the first Americans to today?
53:35
How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?
53:35
Experience the colossal geologic forces that shaped our continent over 3 billion years.
53:07
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.
53:10
Is our universe unique, or could it be just one in an endless "multiverse"?
53:40
Take a wild ride into the quantum realm, where even the impossible seems possible.
53:40
It defines our lives, but what is time really? Have a look into its true nature.