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  1. The tree of life, with tangled roots

    Two ancient, rudimentary organisms merged to create the first complex cell, new data suggest.

    By Ben Harder

  2. Schizophrenia takes fatal turn in China

    Suicides among people with schizophrenia are a major public-health concern in China.

    By Bruce Bower
  3. Anthropology

    Ancient head case

    A 1.8-million-year-old Homo erectus skullcap came from a 1-year-old child whose brain grew at a rate more like that of chimpanzees than of people.

    By Bruce Bower

  4. 19464

    I was pleased to read that one of the most mathematically pretty sphere-stacking arrangements (the lovely 24-cell) occurs in four dimensions. The nice thing about four dimensions is that, by letting time be one dimension and using a good three-dimensional computer-graphics package, the arrangement can be viewed on a computer.