Scientists are one step closer to understanding what happens to some of us when we lose our soulmate. Hello, i m katty kay in washington, christian fraser is in london. We have been talking about iran s nuclear programme for quite literally years. The very phrase iran nuclear talks brings to mind a never ending struggle, sisyphus pushing the boulder up the mountain, again and again. And with the election of the hardliner ebrahim raisi as iran s new president, joe biden s job got even tougher. As a bit of background, the us was one of six countries to reach a deal with iran in 2015. That was under the 0bama administration. Most sides agreed that the deal wasn t perfect, but it was a framework and it held. Until the former president, donald trump, pulled the us out of that deal and re imposed sanctions. Iran restarted its nuclear activity, though to this day tehran still denies it is developing a weapon. Speaking at his first press conference following his election, mr raisi had tough wo