In this episode of UpFront, Mehdi Hasan challenges Yemeni Nobel Laureate Tawakkol Karman. In the Arena, Hasan asks former CIA director James Woolsey about the future of US-Iran relations. He then talks to Ahmed Mohamed, the 14-year-old student who was arrested in Texas for bringing a homemade clock to school. The Headliner: Yemeni Nobel Laureate Tawakkol Karman In 2011, Yemeni Nobel Laureate Tawakkol Karman emerged as a leading voice in Yemen. Earlier this year, she was forced to flee the country after Houthi rebel fighters attacked her home. As war ravages the impoverished country, Karman continues to be a vocal opponent of the Houthis, but is she willing to be so equally critical of the Saudi-led bombing campaign in her country? Arena: What is the future of US-Iran relations? After decades of being demonised by the US, Iran is emerging from international isolation with the nuclear deal. Is the thaw a sign of a new rapprochement between two foes? In this week's Arena, former CIA director James Woolsey, who has compared Iran to Nazi Germany, debates with Trita Parsi, founder and president of the National Iranian American Council (NIAC). Special: Was Ahmed Mohamed arrested because he is Muslim? A clock - that is all it was. But for 14-year-old Ahmed Mohamed from Texas, the simple homemade invention got him arrested when he took it to school. In this UpFront special interview, Mohamed tells Hasan that “this wouldn’t happen to any of my classmates”. He also calls on police officers and school officials to issue an apology, and thanks US President Obama for his invitation to the White House.