Time has always been the great given, the element that establishes the governing facts of human fate that cannot be circumvented, deconstructed, or wished away. But these days we are tampering with time in ways that affect how we live, the textures of our experience, and our very sense of what it is to be human. What is the nature of time in our time? Why is it that even as we live longer than ever before, we feel that we have ever less of this basic good? What effects do the hyperfast technologies--computers, video games, instant communications--have on our inner lives and even our bodies? And as we examine biology and mind on evermore microscopic levels, what are we learning about the process and parameters of human time? Hoffman regards our relationship to time--from jet lag to aging, sleep to cryogenic freezing--in this broad, eye-opening meditation on life's essential medium and its contemporary challenges.