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Effective altruism is a philosophy and social movement focused on answering one question: How can we best help others?
Our resources are limited, so we have to use them wisely. Effective altruism is the project of:

Effective altruism is a collection of concepts, drawn from a range of academic disciplines. See how they relate to each other at EA Concepts.
Effective altruism — efforts that actually help people rather than making you feel good or helping you show off — is one of the great new ideas of the 21st century.
Steven Pinker
Johnstone Family Professor of Psychology at Harvard University, author of 'The Better Angels of Our Nature'
Effective altruism … is matching a clear-eyed approach to doing good with scientific exactitude.
Derek Thompson
Senior Editor, The Atlantic