TEHRAN, IRAN - FEBRUARY 11: Iranian children build model centrifuges out of styrofoam and glue in a competition beneath a banner reading "Nuclear scientists of the next generation," along with pictures of four assassinated Iranian scientists, as Iranians stage a mass rally to mark the 35th anniversary of the 1979 Islamic revolution on February 11, 2014 in Tehran, Iran. From art, film and cultural festivals to rallies in Tehran and across the nation that attracted hundreds of thousands of people, Iran's Islamic Republic this year sees political change and an interim nuclear deal after the election of moderate President Hassan Rouhani. (Photo by Scott Peterson/Getty Images)
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