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  1. The Exquisite Butterfly Companion: The Science and Beauty of 100 Butterflies by Hazel Davies

    This guide to 100 butterfly and moth species comes with a set of butterfly-shaped illustrations to use in craft projects. Sterling Signature, 2011, 88 p., $14.95

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  2. Cosmos Close-up by Giles Sparrow

    A collection of astronomical images taken by telescopes and spacecraft of all kinds gives brief explanations of the science behind each highlighted object. Firefly Books, 2011, 320 p., $29.95

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  3. The Sibling Effect: What the Bonds Among Brothers and Sisters Reveal About Us by Jeffrey Kluger

    A review of recent research shows how siblings affect each other, covering topics such as birth order, blended families and parents who play favorites. Riverhead Books, 2011, 320 p., $26.95

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  4. BOOK REVIEW: Rambunctious Garden: Saving Nature in a Post-Wild World by Emma Marris

    Review by Janet Raloff.

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  5. BOOK REVIEW: Epigenetics: The Ultimate Mystery of Inheritance by Richard C. Francis

    Review by Tina Hesman Saey.

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  6. Life

    Genes & Cells

    How nanotubes trigger a cell’s gag reflex, the skulking 1918 flu and more in this week’s news.

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  7. Life

    Singled Out

    How to study cells, one by one.

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  8. Planetary Science

    Fertile Frontiers

    Alien-life hunters focus on moons in outer solar system

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  9. Health & Medicine

    The Probabilistic Mind

    Human brains evolved to deal with doubt.

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  10. Life

    Penguins may sniff out relatives

    A zoo study sees hints of odor-based kin recognition in colony-dwelling birds.

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  11. Life

    XMRV tie to chronic fatigue debunked

    A virus that was tied to the mysterious syndrome by 2009 research appears to have been a laboratory contaminant.

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  12. Humans

    Humans reached Asia in two waves

    New genetic data show that some early migrants interbred with a mysterious Neandertal sister group.

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