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Three big reasons war is going away

Most of us are going to remember 2014 as a year filled with war and violence. But it turns out there's a deeper story: despite the very real horror this year brought, we're still living through the least violent era in human history. The 21st century has been the most peaceful one our species has ever seen. Zack Beauchamp explains three of the biggest reasons why in two and a half minutes.