Science and technology

Associated Press
United Nations Secretary General Ban Ki-moon, attends a meeting with members of the People’s Summit, a parallel event to the UN Conference on Sustainable Development or Rio+20, in Rio de Janeiro, Brazil, Friday, June 22, 2012. The People’s Summit delegates submitted their final political document drawn up during their Convergence Plenary organized by NGOs and social movements. (AP Photo/Silvia Izquierdo)

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