Actor Robert Downey Jr. is shown in this undated publicity photo released to Reuters April 23, 2008 in a scene from Paramount Pictures film 'Iron Man'. (Zade Rosenthal/Paramount Pictures/Handout/Reuters)Reuters - Superhero movie “Iron Man” pounded the competition at North American box offices for the second straight weekend, landing at No. 1 with $50.5 million in ticket sales, according to studio estimates on Sunday.


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