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Complexities, edited by Susan McKinnon and Sydel Silverman (University of Chicago Press, 拢20/$14), is an attack on the reductionism that suggests biological determinism can answer all our questions about human behaviour. This is a useful gathering together of experts, though you may recognise some of the arguments. You can further sharpen your mind with Chris Scarre鈥檚 wonderful The Human Past (Thames & Hudson, 拢29.95).