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US Secretary of State John Kerry shakes hands Sunday with Iran’s Foreign Minister Javad Zarif in Geneva after a third round of negotiations on Iran’s nuclear program led to a historic initial nuclear deal between Iran and six world powers (Credit: EPA/Martial Trezzini)

US Secretary of State John Kerry shakes hands Sunday with Iran's Foreign Minister Javad Zarif in Geneva after a third round of negotiations on Iran's nuclear program led to a historic initial nuclear deal between Iran and six world powers (Credit: EPA/Martial Trezzini)