Is, as Hamlet once complained, time out joint? Have the ways we understand the past and the future--and their relationship to the present--been reordered? The past, it seems, has returned with a vengeance: as aggressive nostalgia, as traumatic memory, or as atavistic origin narratives rooted in nation, race, or tribe. The future, meanwhile, has lost its utopian glamor, with the belief in progress and hope for a better future eroded by fears of...