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Only 4% of the universe consists of the matter that makes our bodies, the Earth and every star and planet. Over the last few decades scientists have been battling to understand the rest: the strange "dark matter" and even stranger "dark energy". In exhilarating and behind-the-scenes detail, Panek takes us on a tour of the bitter rivalries and fruitful collaborations, the eureka moments and blind alleys, that have fuelled the search, redefined science, and reinvented the universe.