Should I bother to read this book? -- The decision grid: what's the worst that could happen? (or giant mutant space hamsters) -- The nature of science: we never quite know for sure -- Our glitchy brains: have I been a fool? oh, let me count the ways! -- A beautiful rainbow of credibility: the credibility spectrum -- Gear up: mustering for the expedition -- A whole coop of Chicken Littles: statements from warmers -- Everything's going to be just fine: statements from skeptics -- It's not the temp that gets ya: demystifying the doomsday -- Author's conclusion: as if you couldn't already guess -- Reader's conclusion: some assembly required.