The 20 Hottest Celebrity Geeks

19. Kari Byron

As the former host of MythBusters, this redhead had once devoted her career to challenging the truth of various myths. As the star of its spin-off series, Head Rush, budding Bill Nyes-types get one long commercial-free hour every weekday on the Science Channel with Kari Byron, super cool science celebs, and a mixture of experiments and MythBusters mash-ups that'll make any science geek explode with excitement.

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