(NEWSER– 2013 has been a pretty unbelievable year for Jorge Mario Bergoglio, who became Pope Francis,dominated Facebook, and now finds himself Time's Person of the Year. Managing Editor Nancy Gibbs explains how he ended up on the cover after just nine months on the job: because of how he has positioned himself ("at the very center of the central conversations of our time," from wealth to the role of women to justice), for his reach in our flattening world ("far beyond the boundaries of the Catholic Church"), and for what he has accomplished in such a short time. "Something remarkable: he has not changed the words, but he's changed the music."

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