In the early 20th century, the English philosophers Bertrand Russell and G. E. Moore used close conceptual analysis in a concerted critique of the then-dominant forms of Idealism. Their approach was reinforced by the movement of continental philosophers into English-speaking countries in the first half of the century. Analytic philosophy subsequently took various paths, including a rejection of formal analysis in favour of a close examination of natural language, inquiry into the logical underpinnings of languages and renewed interest in the ethical implications of analytic method.