Visionaries -- The dangerous joy of Dr. Sex -- Genius on two dollars a day -- Bird brain -- The strongest woman in the world -- Battery-powered brain -- Vermin supreme wants to be your tyrant -- The chemist in the desert -- One room, three-thousand brains -- The mystic mechanic -- The ballad of Conor Oberst -- How to make (almost) anything -- What we mean by freedom -- First person: stories from my own life -- Boston marriage -- The encyclopedia of scorpions -- Off season.