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  1. Health & Medicine

    Mice reveal the off switch for inflammation

    Working with genetically engineered mice, scientists have identified a crucial natural mechanism that rodents use to shut down inflammation before it does harm.

    By John Travis
  2. Astronomy

    Did Space Rocks Deliver Sugar?

    Planetary scientists have for the first time detected sugar compounds in meteorites, bolstering the view that space rocks seeded the early Earth with ingredients essential for the development of life.

    By Ron Cowen
  3. Math

    Polyhedron Man

    Mathematician and artist George Hart has created a variety of sculptures based on polyhedra and collaborated with other researchers to define and visualize new geometric shapes.

    By Ivars Peterson

  4. From the December 12, 1931, issue

    SCIENCE AT THE WORLDS CROSSROADS Everybody has heard of Barro Colorado, the hill that was turned into an island, and was set aside as a great animal sanctuary; but only a few persons have ever set foot on it.