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Feeling secure in our everyday here-and-now? Then let Stephen Baxter reveal to you disturbing traces of other traces of other pasts, other presents, other futures. Here are vestiges of civilizations lost, long-gone, footprints of passing life-forms, visions of histories that differ from our own, some in small ways, some through a fundamental difference in physical laws. Here are twenty-one extraordinary stories from the best science fiction writer of his generation.