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Cover Figure


COVER Unseen matter and energy predominate in the universe, raising some seemingly simplistic yet fundamental questions: Does it clump? Does it swirl? If more is added, will it curl? The answers remain elusive, but exciting advances are highlighted in this issue. [Illustration: Cameron Slayden] 1893

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Science. ISSN 0036-8075 (print), 1095-9203 (online)