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  1. Genes & Cells

    The genes for caffeine cravings, plus rare variants and shaping eyes in this week’s news.

    By Science News

  2. Hanging in the balance

    What is the fate of the universe?

    By Elizabeth Quill

  3. Out of the fabric

    Are space and time fundamental?

    By Tom Siegfried

  4. Strung together

    Is there a theory of everything?

    By Matt Crenson

  5. In the dark

    What is the universe made of?

    By Alexandra Witze

  6. Pre-Bang branes and bubbles

    What happened before the big bang?

    By Ron Cowen

  7. Cosmic questions, answers pending

    Special section

    By Tom Siegfried

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

    Review by Tom Siegfried.