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The Thirteenth Tribe is a 1976 book by Arthur Koestler, in which he advances the thesis that Ashkenazi Jews are not descended from the historical Israelites of antiquity, but from Khazars, a Turkic people. Koestler's hypothesis is that the Khazars migrated westwards into Eastern Europe in the 12th and 13th centuries …

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The Ghost in the Machine is a 1967 book about philosophical psychology by Arthur Koestler. The title is a phrase coined by the Oxford philosopher Gilbert Ryle to describe the Cartesian dualist account of the mind–body relationship. Koestler shares with Ryle the view that the mind of a person is not an independent …
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