Aiyar, the president of the Harvard Advocate, shared Wu's surprise. She said she was "obviously very shocked and happy."
"I was dazed by the grueling week-long interview process," the social studies concentrator said.
Aiyar, who also worked with PBH, said she plans to get a Master's in politics at Oxford.
The winners said their success was mostly a result of loving what they do.
"I really think anyone can win it," Atwan said. "It's the most passionate, well rounded people who end up getting chosen in the end. It's not a genius prize. It's a well-rounded prize."
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Ariel R. Frank contributed to the reporting of this story.