U.S. first lady Michelle Obama waves to the audience during a youth event at the Sci-Bono Discovery Centre, Saturday, June 29, 2013, in Johannesburg, South Africa, organized in conjunct

 

              U.S. first lady Michelle Obama waves to the audience during a youth event at the Sci-Bono Discovery Centre, Saturday, June 29, 2013, in Johannesburg, South Africa, organized in conjunct
U.S. first lady Michelle Obama waves to the audience during a youth event at the Sci-Bono Discovery Centre, Saturday, June 29, 2013, in Johannesburg, South Africa, organized in conjunction with MTV Base, an African youth and music TV channel, and Google+ to highlight the importance of education. Teenagers from around South Africa as well as students joining virtually in cities around the U.S. will participate. (AP Photo/Carolyn Kaster)