"Your brain is a muscle, too, " says Newton, a college dropout and former graphic design teacher who was once the science adviser on the Discovery Channel's hit series MythBusters.

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Palin will also earn income from an Alaska-themed series on the Discovery Channel.

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"American Chopper" premiered as a Discovery Channel special in 2002, then launched as a regular series a few months later.

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While Discovery Channel maintains that it had already made the decision to drop the series because of low ratings, American Guns drew ire in light of the shootings, and made repeats out of the question.

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