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The debate about torture and water-boarding was back into the spotlight in the US recently, with Donald Trump's claims that he would bring it back "in a heartbeat". But Shane O'Mara, professor of Experimental Brain Research at Trinity College, Dublin, says that torture is the worst technique for interrogating people. (Photo: Activists of Amnesty International demonstrate against torture in front of the Journalist Club in Mexico City. Credit: AFP/Getty Images)
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