Jeff Han

AGE: 33
OCCUPATION: Perceptive Pixel founder
PREVIOUS APPEARANCES ON THE TIME 100: 1

PRO: It's been only two years since Han introduced Multi-Touch, a technology that allows users to manipulate digital screens using multiple fingers; now it's everywhere, from your iPhone to CNN's election-season "magic wall."

CON: When CNN correspondents get too tap-happy, the results can be dizzying. Would it kill John King to use an overhead projector?

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