A university psychology professor who periodically writes for mass media, Marcus here punctures the high regard humanity has for its species-distinctive qualities. Whether it’s memory, rationality, language, or free will, our noble human traits are hopelessly entangled with our baser drives, which have survived the dynamics of evolution. Blending discussion of experiments from cognitive psychology with speculation about why people are far less logical than they believe, Marcus latches onto the term kluge, which comes from the engineering world and is jargon for a fix that ain’t perfect but good enough. It’s a productive figure of speech for Marcus’ argument that deliberative thinking probably had an evolutionary advantage (save seeds to plant next season), but seems in permanent conflict with reflexive impulses having more ancient evolutionary advantage (eat seeds now). Carrying the point across a gamut of behaviors, from money to mental illnesses to talking, Marcus develops his idea of the klugelike mind, in which emotion perpetually besieges the intellect, with appealing clarity. --Gilbert Taylor