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In what year was Moore's best-known work published?

1906
1910
1899
1914

Answer

Moore's best-known work, Principia Ethica, was published in 1906. The book is a foundational work in analytic philosophy, and it introduced the concept of "naturalistic fallacy". Moore argued that it is impossible to derive an "ought" from an "is", meaning that it is impossible to derive a moral statement from a factual statement. This idea has been influential in subsequent philosophical debates about ethics.