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What Are Dreams - Preview
Airs Wednesday, August 22, 2012 at 9:00 p.m. ET/PT. Check your local listings.
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Decoding Neanderthals Preview
Shared DNA reveals a deep connection with our long-vanished human cousins.
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The Fabric of the Cosmos: What Is Space? Preview
Surprising clues indicate that space is very much something and not nothing.
NOVA
The Fabric of the Cosmos: The Illusion of Time Preview
It defines our lives, but what is time really? Have a look into its true nature.