How much do the Great Satan and the Axis of Evil have in common? Quite a bit, it turns out. They share a mutual antipathy towards Islamic State militants and a mutual desire for a stable Afghanistan. There has been cautious optimism in Washington and Tehran about the talks over Iran’s nuclear programme. And yet there is a legacy of hate and mistrust on both sides that goes back decades. How far can today’s leaders overcome the past to work together on common goals? We have answers from experts who travel back and forth between the two countries, including a former ayatollah. (Image: U.S. Secretary of State Kerry and Iranian FM Zarif shake hands - Reuters Wires)