Excerpt - Vienna, 21 August (AKI) - Just hours before Iran is due to give world powers its response to a package of incentives aimed at persuading the country to give up its nuclear activities, new centrifuges have been installed at the Natanz uranium enrichment facility over the past two weeks, an anonymous source at the United Nations nuclear watchdog told Adnkronos International (AKI). Meanwhile, the country's heavy water reactor at nearby Arak in central Iran "will shortly be operational," the second in command of Iran's nuclear programme, Mohammad Saidi, was quoted as saying. Also on Monday, inspectors from the...