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National Geographic has uploaded It's All About the Crunch Experts explain why food li...

National Geographic has uploaded It's All About the Crunch It's All About the Crunch National Geographic Experts explain why food like Doritos is so highly addictive. THREE-NIGHT MINISERIES EVENT STARTS FRIDAY NOVEMBER 21 at 9P. © 2014 YouTube, LLC 901 Cherry Ave, San Bruno, CA 94066 You were sent this email because you chose to receive updates from National Geographic. If you don't want these updates anymore, you can unsubscribe here.