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You can feel it. Or maybe you can't. It doesn't matter whether you feel it or not. It's happening. The story of the United States of America as we know it -- not merely as the world's dominant superpower, but as a discrete political, economic, and geographic entity -- is drawing to a close due to a convergence of emerging economic, environmental, and political crises. Nothing lasts forever, empires least of all. And this one, which only began to expand in earnest circa the year 1900, doesn't feel like it has the staying power of ancient Rome. Not at all.

Time isn't what it used to be  TIME is not what it used to be. Once a flowing river whose current we passively monitored, time is now more properly understood as something constructed by the brain and personalised by culture. We have relationships with time; we fight it and manipulate it. Into this arena steps Eva Hoffman with her poetically scientific and austerely titled Time. Hoffman is on an exploration to become intimate with time, motivated by her sense that our interaction with time has changed. Our societies have become obsessed with time and timekeeping, both in the workplace and at home. Jet travel manipulates our experience of day-night cycles and seasons, while biomedical science races to increase our lifespan yet further. At the other end of the spectrum, new technologies adapt our minds to the ever-briefer scales of micro and nano. Hoffman covers a lot of ground, from physics (why time flows in only one direction) to biology (the circadian rhythm and sleep) to neuroscience (how temporality is constructed by the brain). She addresses questions of time and consciousness, including the uniquely human ability to envision large vistas of past or future. Perceived time is illuminated by disease states such as Alzheimer's disease or Korsakoff's syndrome, in which one's time narrative becomes disorganised, and by fantasies and dreams, in which the unconscious brain does not necessarily commit to a temporal narrative at all. Hoffman also investigates individual differences in how people treat time (those who leave parties early versus those who have to be shooed out at the end) as well as cultural differences (communities in which haste amounts to a breach of ethics, for instance). A recurring theme is that the human capacity to manipulate our environment ushers in new complexities to the basic biology of time. For example, while other animals age and die on a strict schedule, humans do everything in their power to control that timing. And the book is full of