Effective altruism is about asking, “How can I make the biggest difference I can?” and using evidence and careful reasoning to try to find an answer. It takes a scientific approach to doing good. Just as science consists of the honest and impartial attempt to work out what’s true, and a commitment to believe the truth whatever that turns out to be, effective altruism consists of the honest and impartial attempt to work out what’s best for the world, and a commitment to do what’s best, whatever that turns out to be.