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  1. Hunting Hidden Dimensions

    Black holes, giant and tiny, may reveal new realms of space.

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  2. Physics

    A very special snowball

    The long-predicted ice XV has been spotted in the lab.

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  3. Broken Symmetry

    Scientists seek mechanisms explaining development of the body’s left-right pattern.

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  4. Book Review: Stories in Stone: Travels Through Urban Geology by David B. Williams

    Review by Sid Perkins.

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  5. Homage to a Pied Puzzler

    Ed Pegg Jr., Alan H. Schoen and Tom Rodgers, eds.

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  6. Theo Gray’s Mad Science: Experiments You Can Do at Home — But Probably Shouldn’t by Theodore Gray

    Dramatic experiments, captured in color photography with step-by-step instructions, demonstrate scientific principles from the everyday world.