Natural history

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  Año 2007, Vol. 116, Número 7 (SEP)

  • Over easy.

    Erin Espelie, Peter Blackwell (fot.)

    págs. 2-4

    

  • New Light on Dark Matter.

    Peter Brown

    pág. 6

    

  • Dark Matter: Most of the matter in the Universe is neither bound up in stars or planets nor dispersed in clouds of "ordinary" particles. Experimenters are racing to answer the question, what is it made of?.

    Donald Goldsmith

    págs. 18-23

    

  • Altruism among Amoebas: A person who dies so that others can escape starvation is a hero. But how can evolution explain the same behavior in an nonhuman organism whose genes are "selfish"?.

    Joan E. Strassmann, David C. Queller

    págs. 24-29

    

  • Rendezvous at Red Rock: Nestled in a dry landscape, an Oklahoma canyon harbors a lush woods.

    Robert H. Mohlenbrock

    págs. 32-33

    

  • Literary Gould.

    Laurence A Marschall

    págs. 34-35

    

  • Surprise Package: A supermassive black hole may lie at the heart of an intergalactic collision.

    Charles Liu

    págs. 38-39

    

  • The sky in September.

    Joe Rao

    pág. 48