Food on floor, catnaps as diplomats sealed Iran nuclear deal

US Secretary of State John Kerry, centre watches on a tablet as the US President Barack Obama addresses the US, at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)WASHINGTON (AP) — Food boxes strewn across the floor. An espresso machine buzzing constantly in the background. Physicists catnapping, their heads on tables.

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