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I'm Mark Smith at a snowbound White House where President Barack Obama is trying to unthaw his domestic agenda in a new round of talks with Democratic and Republican leaders. And a short time ago, he paid a surprise visit to the White House briefing

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Ever get a sour stomach after your morning coffee? Well, you might end up switching to a dark roastbecause that coffee concoction may leave you with a happier tummy. That's according to the research presented at the American Chemical Society meeting

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