GENEVA - Against a backdrop of cautious optimism, Iran and six world powers known as the P5+1 are reconvening here for talks today and tomorrow over Tehran's nuclear program. The P5+1 comprises the five permanent members of the UN Security Council - United States, Britain, France, Russia and China - plus Germany. "This government [of Iranian President Hassan Rouhani] has a lot riding on the resolution of the nuclear issue because it made it a campaign promise and priority," Farideh Farhi, an Iran expert at the University of Hawaii, told IPS. She stressed that even if the Iranians were desperate for a deal, Iran won't give up certain bottom lines. "The acceptance of a bad deal is politically even more dangerous for Rouhani than not reaching an agreement," she said from Tehran in a phone interview. One of Iran's bottom lines includes what it considers its right to peacefully enrich uranium as a signatory to the Nuclear Non-Pr...