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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

Imagine, Michael Chorost proposes, that four police officers on a drug raid are connected mentally in a way that allows them to sense what their colleagues are seeing and feeling. Tony Vittorio, the captain, is in the center room of the three-room drug den. He can sense that his partner Wilson, in the room on his left, is not feeling danger or arousal and thus has encountered no one. But suddenly Vittorio feels a distant thump on his chest. Sarsen, in the room on the right, has been hit with something, possibly a bullet fired from a gun with a silencer. Vittorio glimpses a flickering image of a metallic barrel pointed at Sarsen, who is projecting overwhelming shock and alarm. By deducing how far Sarsen might have gone into the room and where the gunman is likely to be standing, Vittorio fires shots into the wall that will, at the very least, distract the gunman and allow Sarsen to shoot back. Sarsen is saved; the gunman is dead. That scene, from his new book, "World Wide Mind," is an example of what Mr. Chorost sees as "the coming integration of humanity, machines, and the Internet." The prediction is conceptually feasible, he tells us, something that technology does not yet permit but that breaks no known physical laws.