Peer Review is a process that journals use to ensure the articles they publish represent the best scholarship currently available. When an article is submitted to a peer reviewed journal, the editors send it out to other scholars in the same field (the author's peers) to get their opinion on the quality of the scholarship, its relevance to the field, its appropriateness for the journal, etc.
Publications that don't use peer review (Time, Cosmo, Salon) just rely on the judgement of the editors whether an article is up to snuff or not. That's why you can't count on them for solid, scientific scholarship.
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Demonstrators in Los Angeles on July 16, 2013, protest the acquittal of white neighborhood watch volunteer George Zimmerman in the shooting death of Trayvon Martin, an unarmed black Florida 17-year-old. The verdict touched off a nationwide debate on racial profiling, which minority groups say is widespread. Two major court cases target the New York Police Department's stop-and-frisk policy and Arizona Sheriff Joe Arpaio's controversial immigration-related profiling. (Getty Images/Kevork Djansezian)