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#730 - Demetrious Johnson

Release Date: 12/03/2015

The Joe Rogan Experience

Matthew Walker is Professor of Neuroscience and Psychology at the University of California, Berkeley, and Founder and Director of the Center for Human Sleep Science. Check out his book "" on Amazon.

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Demetrious Johnson is a mixed martial artist. He is the first and current Flyweight Champion of the Ultimate Fighting Championship.
http://www.twitch.tv/mightymouseufc125

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