Much is asked of the concept of chance. It has been thought to play various roles, some in tension, or even incompatible, with others. Chance has been characterized negatively as the absence of causation; yet also positively—the ancient Greek "tyche" reifies it—as a cause of events not governed by laws of nature, or as a feature of laws of nature. Chance events have been understood epistemically as those whose causes are unknown; yet also objectively as a distinct ontological kind, sometimes called "pure" chance events. Chance gives rise to individual unpredictability and disorder; yet it yields collective predictability and order: stable long-run statistics and, in the limit, aggregate behavior susceptible to precise mathematical theorems. Some authors believe that to posit chances is to abjure explanation; yet others think that chances are themselves explanatory. During the Enlightenment, talk of chance was regarded as unscientific, unphilosophical, the stuff...