US President Barack Obama is reflected in a map of Africa as he participates in a town hall-style meeting with young African leaders at the University of Johannesburg Soweto, June 29, 2013. [Photo/Agencies]

Members of the audience react as US President Barack Obama arrives to participate in a town hall-style meeting with young African leaders at the University of Johannesburg Soweto, June 29, 2013. [Photo/Agencies]