SCIENCE
12/31/2012 08:03 am ET

What Is Time? Theoretical Physicist Sean Carroll Explains Time's Arrow (VIDEO)

Have you ever stopped to ask yourself, "what is time?" We all understand its passage intuitively, experientially. But does time actually exist? Is it a force of nature? A tangible entity? Or is time a human construct--an attempt to comprehend the incomprehensible?

I spoke with theoretical physicist and perhaps the world's premier expert on the science of time, Sean Carroll, to learn more.

Watch the video above and/or click on the link below for a full transcript. And don't forget to sound off in the comments section at the bottom of the page. Come on, talk nerdy to me!

CLICK HERE FOR FULL TRANSCRIPT

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