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

Greek supporters of the "no" vote celebrate at Syntagma Square in Athens on Sunday night after the results were announced. Greeks overwhelmingly rejected the demands of creditors for more austerity in return for rescue loans. But the country has no clear way out of its financial crisis. Petr David Josek/AP hide caption

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Berlin's Humboldt University — named for its founder, the 19th century philosopher and linguist Wilhelm von Humboldt, and his brother, naturalist Alexander von Humboldt, pictured here — is one of several German universities attracting U.S. students. More than 4,000 Americans are studying in German universities. Markus Schreiber/AP hide caption

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Greeks stand outside of a local school in Athens that served as a voting station. Chris Arnold/NPR hide caption

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To the delight of American fans, Carli Lloyd of the United States scored a hat trick in the first 15 minutes of the FIFA Women's World Cup Final against Japan on Sunday. Kevin C. Cox/Getty Images hide caption

itoggle caption Kevin C. Cox/Getty Images