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Three approaches to the nature of human rationality are considered: Daniel Kahneman and Amos Tversky on decision making, David Hume on causation, and Peter Strawson on morality. All are seen as deploring the state of rational thought and despairing of the human capacity for logic. Their implicit model of the perfectly rational human is explored with the help of Mr. Spock and found to be of doubtful value considered in terms of evolutionary survival, where "prejudgment" is essential to decision making under stress. The glimmerings of this insight are found in Hume's "therapeutic" solution to his existential dilemma, and a general argument is made-with the help of side glances at prototype theory, linguistics, categorical thinking, and archetypes-that rationality cannot be equated with "logic" as generally understood but rather consists of a series of pragmatic prejudgments of reality that have stood the test of natural selection. This leads to a reconstruction of the idea of "prejudice" from a negative to a mildly positive attribute, with examples drawn from Charles Lamb and Paul Robeson, and hence to the conclusion that prejudice is not a warped form of thought but that thought is a particular form of prejudice.

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Oestrogen and androgen states have been studied in relation to ovarian morphology defined by ultrasonography in 65 women with oligo-amenorrhoea. Of the 48 women with polycystic ovaries (PCO), 44 (92%) had a withdrawal bleed following progestogen challenge (indicating oestrogenization) compared with just three (18%) of the 17 with non-PCO (P

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