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The story of the boy drowning in the pond is perhaps the best known. One day you are walking by a pond and you see a boy drowning. You have two options: save him and ruin your new clothes or let him die. Obviously everyone chooses to save the child. However, few are those who choose to donate the money that cost those clothes to save a child who is at risk of dying in another part of the world. Singer arrives at a concept of effective altruism, as a good utilitarian, in which one should reduce suffering and extreme poverty as effectively as possible. He is also known for his writings on animal liberation. Ah, I am in San Pedro, province of Buenos Aires.