According to a new analysis, with so many scientific papers and so few pages available in the most prestigious journals, the "winners" could be the ones most likely to oversell themselves rather than the best science. In other words, they are likely to be the ones that trumpet dramatic or important results -- results that often later turn out to be false.

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http://articles.mercola.com/sites/articles/archive/2008/11/04/why-you-can-t-trust-most-studies-on-health.aspx