Book excerpt: Haskell explores topics ranging from the productivity of slave labor to the cultural concomitants of capitalism, from John Stuart Mill's youthful "mental crisis" to the cognitive preconditions that set the stage for antislavery and other humanitarian reforms after 1750. He traces the surprisingly short history of the word responsibility, which turns out to be no older than the United States. And he asks whether the epistemological radicalism of recent years carries the power to justify human rights - rights of academic freedom, for example, or the right not to be tortured.