Mary Dejevsky: Positive signals from Iran - but only if you listen carefully
Of all the challenges that Barack Obama has thrown out to the world since he entered the Oval Office, the most daring is his overture to Iran. It featured in his inaugural address as a general invitation to adversaries. It was addressed specifically to Iran in his television interview with al-Arabiya. And this weekend it was voiced even more insistently by his Vice-President, Joe Biden.


