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I'm not usually one to share this sort of thing, but I thought this was possibly the best TED talk I've ever seen.
Peter Singer is an Australian moral philosopher.
He is currently the Ira W. DeCamp Professor of Bioethics at Princeton University, and a Laureate Professor at the Centre for Applied Philosophy and Public Ethics at the University of Melbourne. He specializes in applied ethics and approaches ethical issues from a secular, utilitarian perspective. (H/T Wiki)