U.S. first lady Michelle Obama, right, pays her respects with Antoinette Sithole, left, the sister of the late Hector Pieterson, after laying wreath at the memorial in Soweto, South Africa Wednesday June 22, 2011. Peaceful child protesters were gunned down by police 30 years ago in an attack that awakened the world to the brutality of the apartheid regime. At left, is an iconic picture of Antoinette, running with mouth open in a scream alongside a friend carrying the body of her slain brother, Hector. (AP Photo/Themba Hadebe)