PHOTOS: Earlier, Obama in South Africa and Senegal
President Obama and first lady Michelle Obama arrived Monday in Dar es Salaam, Tanzania, the last stop on a week-long tour of Africa that wrapped up Tuesday.
July 2, 2013 President Obama heads a soccer ball at Ubungo Power Plant in Dar es Salaam, Tanzania. The ball has internal electronics that allow it to generate and store electricity that can power small devices. Jason Reed/Reuters