Street children sleep on a discarded mattress on a center island near a road crossing in Manila in April. After 15 years of the Millennium Development Goals, Asia as a region has had the fastest progress, reports the U.N., yet hundreds of millions of people there remain in extreme poverty. Jay Directo/AFP/Getty Images hide caption

itoggle caption Jay Directo/AFP/Getty Images

Greek Finance Minister Yanis Varoufakis walks toward his motorcycle following a meeting with Prime Minister Alexis Tsipras in Athens, Greece, on March 15. Varoufakis said Monday he was resigning, a day after Greeks voted to reject terms of a bailout imposed by Greece's creditors. Varoufakis was one of the leading campaigners behind the "no" vote. Pantelis Saitas/EPA/Landov hide caption

itoggle caption Pantelis Saitas/EPA/Landov