A collection of essays about science, the world, and our relation to both, which explores the influence of that notorious hormone on male aggression. “Curious George’s Pharmacy” reexamines recent exciting claims that wild primates know how to medicate themselves with forest plants. “Junk Food Monkeys” relates the adventures of a troop of baboons who stumble upon a tourist garbage dump. And “Circling the Blanket for God” examines the neurobiological roots underlying religious belief.

How big is yours? -- Primate peekaboo -- The night you ruined your pajamas -- Measures of life -- The young and the reckless -- The solace of patterns -- Beelzebub's SAT scores -- Poverty's remains -- Junk food monkeys -- The burden of being burden-free -- The trouble with testosterone -- The graying of the troop -- Curious George's pharmacy -- The dangers of fallen soufflés in the developing world -- The dissolution of ego boundaries and the fit of my father's shirt -- Why you feel crummy when you're sick -- Circling the blanket for God.