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President Barack Obama kicks around an energy-generating soccer ball at a power plant in Dar es Salaam, Tanzania, on Tuesday, July 2. Obama was pushing for partnerships in energy as he concluded a three-nation trip to Africa. Tanzanian President Jakaya Kikwete, third from right, joined Obama at the Symbion Power Plant at Ubungo. SAUL LOEB/AFP/Getty Images
Tanzania's president, left, watches as Obama plays with the energy-generating soccer ball at the Symbion Power Plant on July 2. "I don't want to get too technical, but I thought it was pretty cool," Obama said of the ball that harnesses kinetic energy to provide power.
SAUL LOEB/AFP/Getty Images
SAUL LOEB/AFP/Getty Images
Former President George W. Bush joins Obama during a July 2 wreath-laying ceremony in Dar es Salaam to honor the victims of the 1998 terror attack at the U.S. Embassy in Tanzania. Evan Vucci/AP
A Tanzanian band plays as the U.S. president and first lady Michelle Obama arrive in Dar es Salaam on Monday, July 1. SAUL LOEB/AFP/Getty Images
Traditional dancers perform as Tanzanian first lady Mama Salma Kikwete greets Michelle Obama in Dar es Salaam on July 1. JIM WATSON/AFP/Getty Images
Tanzanian President Jakaya Kikwete toasts Obama during an official dinner at the State House in Dar Es Salaam on July 1. SAUL LOEB/AFP/Getty Images
Obama and Kikwete, right, are greeted by a cheering crowd as they arrive at the State House in Dar es Salaam, Tanzania, on Monday, July 1. Carolyn Kaster/AFP/Getty Images
Ahmed Kathrada, a former fellow prisoner with Nelson Mandela, shows the Obama family around Robben Island in Cape Town, South Africa, on Sunday, June 30. The island, where prisoners were banished and isolated during the apartheid era, is now a museum. JIM WATSON/AFP/Getty Images
Obama looks out the window of the cell on Robben Island where Nelson Mandela was imprisoned. JIM WATSON/AFP/Getty Images
Obama delivers a speech at the University of Cape Town in Cape Town, South Africa, on June 30. Michelly Rall/Getty Images
Obama visits the Desmond Tutu HIV Foundation Youth Centre with Nobel peace laureate Archbishop Desmond Tutu and 15-year-old Aviwe Mtongana in Cape Town on June 30. SAUL LOEB/AFP/Getty Images
Obama, foreground left, and first lady Michelle Obama, beside him, are greeted by South African President Jacob Zuma and his wife, Tobeka Madiba Zuma, on the steps of the Union Buildings upon their arrival in Pretoria, South Africa, on Saturday June 29. Jerome Delay/AP
Obama answers a question during a town hall meeting at the University of Johannesburg Soweto in Johannesburg, South Africa, on June 29. SAUL LOEB/AFP/Getty Images
Obama and Zuma speak during a press conference at the Union Buildings in Pretoria, South Africa, on June 29. JIM WATSON/AFP/Getty Images
Marine One takes off as the Obamas leave the Union Buildings on June 29 in Pretoria. Dan Kitwood/Getty Images
Michelle Obama participates in a discussion with students on the importance of education June 29 at the Sci-Bono Discovery Centre in Johannesburg. STEPHANE DE SAKUTIN/AFP/Getty Images
USAID administrator Rajiv Shah, left, looks on as Obama talks to Nimna Diayte, president of the Farmers Federation, during a food security expo on Friday, June 28, in Dakar, Senegal. Obama met with farmers, innovators, and entrepreneurs whose new methods and technologies are improving the lives of smallholder farmers throughout West Africa. Evan Vucci/AP
Obama shows the White House press corps what rice looks like before it's threshed on June 28 in Dakar. JIM WATSON/AFP/Getty Images
Obama toasts with Senegalese President Macky Sall during an official dinner at the Presidential Palace in Dakar on Thursday, June 27. JIM WATSON/AFP/Getty Images
Barack and Michelle Obama look out from the Door of No Return while touring the House of Slaves at Goree Island off the coast of Dakar, Senegal, on Thursday, June 27. SAUL LOEB/AFP/Getty Images
Senegal's President Macky Sall, right, and Sall's wife, Marieme Faye Sall, left, welcome the president and first lady as they arrive at the presidential palace prior to meetings in Dakar on June 27. SAUL LOEB/AFP/Getty Images
President Obama reviews an honor guard outside the presidential palace in Dakar on June 27. SAUL LOEB/AFP/Getty Images
Obama talks with Sall during a bilateral press conference on June 27. JIM WATSON/AFP/Getty Images
Obama and Sall walk to a press conference. JIM WATSON/AFP/Getty Images
Obama talks on June 27 during a press conference. JIM WATSON/AFP/Getty Images
Obama speaks with locals as he tours Goree Island off the coast of Dakar on June 27. JIM WATSON/AFP/Getty Images
