Sam Harris speaks with David Edmonds about moral philosophy and effective altruism. They discuss Edmonds's book Death in a Shallow Pond, Peter Singer's famous drowning child thought experiment, arguments for and against thought experiments, "trolleyology," consequentialism, the origins of the Effective Altruism movement, the controversial strategy of "earning to give," Derek Parfit's influence on contemporary ethics, the backlash against effective altruists, Angus Deaton's critique of the efficacy of foreign aid, and other topics.

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