How are we different from chimps? Scientists have focused on the similarities between the two species, when in fact it is an understanding of their differences that can reveal "what, exactly, it means to be human." Cohen's survey spans investigations into the chimp genome, brain, and physiognomy,.

The family tree -- Two become one -- In sickness and health -- Of epidemic proportions -- Talking apes -- The fox in the chimp house -- Mind the gap -- Head to head -- Walk this way -- Carnal knowledge -- It's a chimps life -- Born to be wild.