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Inside the Competitive Mind of Billionaire Mark Zuckerberg (Infographic)

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This story appears in the July 2012 issue of Entrepreneur. Subscribe »

Fierce competitors: born or made? There's plenty of evidence to suggest that some individuals are just hard-wired that way.

People with higher levels of testosterone (associated with dominance) and low levels of cortisol (stress) typically participate in riskier behaviors and remain "calm, cool and collected" under pressure, says Pranjal Mehta, head of the University of Oregon's Social Psychoneuroendocrinology Lab.

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