jan 1, 1939 - G.E. Moore published "Proof of an External World"

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- refuted philosophical scepticism and idealism with his own common sense solutions
- most famously in this book he states that he could raise one hand saying "here is one hand" and "here is another"

- similar response would be Samuel Johnson kicking a rock and saying "I refute it thus!" in response to Berkeley's denial of matter

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