"The Head of Iranian Atomic Energy Organization Ali Akbar Salehi, 2nd right, talks with Hossein Fereydoon, special assistant to the Iranian president, while walking through a garden at the Beau Rivage Palace Hotel during an extended round of talks on Iran's nuclear programme, in Lausanne, Switzerland, Thursday April 2, 2015. Iran's foreign minister says his country and six others have made ""significant progress"" at marathon all-night nuclear talk sessions. But Mohammad Javad Zarif said Thursday that agreement still remains to be written, adding there is not yet a ""final result."" (AP Photo/Brendan Smialowski, Pool)"
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