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Max Levchin, Paypal Co-founder, Slide founder
Max Levchin, Paypal Co-founder, Slide founder
40 under 40 rank: 25

I am not much given to regret, so I puzzled over this one a while. Should have taken much more statistics in college, I think. :) --Jessi Hempel

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Last updated October 28 2009: 10:08 PM ET
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