U.S. first lady Obama speaks to students at Martin Luther King middle school, an all-girls school in Dakar, Senegal

U.S. first lady Michelle Obama speaks to students at Martin Luther King middle school, an all-girls school in Dakar, Senegal June 27, 2013. U.S. President Barack Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney