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  1. Hanging in the balance

    What is the fate of the universe?

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  2. Out of the fabric

    Are space and time fundamental?

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  3. Strung together

    Is there a theory of everything?

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  4. In the dark

    What is the universe made of?

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  5. Pre-Bang branes and bubbles

    What happened before the big bang?

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  6. Cosmic questions, answers pending

    Special section

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  7. Book Review: The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos by Brian Greene

    Review by Tom Siegfried.

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  8. Book Review: The Social Animal: The Hidden Sources of Love, Character, and Achievement by David Brooks

    Review by Bruce Bower.

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  9. Cosmic Challenge: The Ultimate Observing List for Amateurs by Philip S. Harrington

    This guide to observing the heavens beckons backyard astronomers to find 187 targets using instruments ranging from bi­noculars to monster scopes. Cambridge Univ. Press, 2011, 469 p., $45.    

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  10. Discoverers of the Universe: William and Caroline Herschel by Michael Hoskin

    An in-depth account of the lives of sibling astronomers William and Caroline Herschel, who discovered Uranus, comets galore and much more. Princeton Univ. Press, 2011, 237 p., $29.95.        

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  11. How Old is the Universe? by David A. Weintraub

    An astronomer outlines the research showing that the universe is 13.7 billion years old. Princeton Univ. Press, 2011, 370 p., $29.95.           

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  12. Seven Wonders of the Universe That You Probably Took for Granted by C. Renée James

    A lighthearted tour of everyday phenomena like light, time and gravity that also explores what makes Earth special and the evolution of life. Johns Hopkins Univ. Press, 2011, 240 p., $25.    

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