That could tally with the additional demand from Apple as its contract manufacturers begin stamping out iPhones and a rumored higher-capacity memory player.

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Modern Warfare 3 could sell an additional 8 million copies in 2012 and Battlefield 3 could tally another 2 million units sold next year.

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It's also possible, says Mathur, that the release of methane slows the transit of digested food through the intestinal tract, and that could increase the time for additional calories from digested food to be absorbed and added to the body's tally.

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