Once a company gets too big and established, though, such workers often want to bolt to another start-up.

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Bolt was the intriguing up-and-comer.

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Bolt was clearly up out of the blocks before the starting gun -- which under next year's new rules would have disqualified him automatically.

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Asked about plans for acquisitions, Pfizer said its focus is on "bolt-on" deals, meaning purchases of companies with complementary businesses or products, with a price tag of up to several billion dollars.

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Bolt, who missed the 2006 Games through injury, will be absent from Delhi to instead continue his ongoing build-up for the London 2012 Olympics.

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