A physician and Nobel-prizewinning chemist at Johns Hopkins University in Baltimore, Maryland, Peter Agre has never shied away from politics. In 2007 he briefly considered running for the US Senate; in 2009 he became president of the American Association for the Advancement of Science (AAAS) and, with the association's Center for Science Diplomacy, began to engage with some of his country's bitterest political enemies. Over a shaky mobile-phone line from rural Zambia, where he is assisting efforts to combat malaria, Agre spoke to Nature about his recent visits to Cuba and North Korea.
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