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OUR conception of time intimately informs what it is to be human: with awareness of time comes awareness of one’s mortality. Time’s definition is elusive but Dan Falk is keen to track it down. In this thoroughly readable, broad-sweeping and thought-provoking book, Falk surveys humanity’s attempts to record and understand time, and poses some fascinating questions. How does the brain tell time? Is time a feature of the world or of the mind? For answers, he turns to philosophy and to physics, where only one thing is certain: as tells Falk, “Time is not what we…