Powers: A History

Why does a wine glass break when you drop it, whereas a steel goblet does not? The answer may seem obvious: glass, unlike steel, is fragile. This is an explanation in terms of a power or disposition: the glass breaks because it possesses a particular power, namely fragility. Seemingly simple, such intrinsic dispositions or powers have fascinated philosophers for centuries. A power's central task is explaining why a thing changes in the ways that it does, rather than in other ways: powers sh...