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Where Did the Cannabis Plant Come From?
While the origins of the cannabis plant remain unknown, geneticists can trace its evolution and identify its closest living relative.
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53:07
Retrace the thought experiments that inspired his theory on the nature of reality.
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.
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53:41
Watch as the New Horizons spacecraft captures our first clear view of Pluto’s icy surface.
53:40
The catastrophic collapse of the ground beneath our feet is a growing worldwide hazard.
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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"?