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  1. Paddle Power: Surprising shape of key cellular pore unveiled

    A molecular pore that controls the flow of ions into cells has an unexpected shape and mechanism.

    By John Travis
  2. Math

    A Geometric Superformula

    The notion of a simple equation that you can use to generate a wide variety of geometric shapes is an immensely appealing one. Johan Gielis of Antwerp, Belgium, proposes one such formula in the March American Journal of Botany. “Many geometrical forms, both in nature and culture, can be interpreted as modified circles,” Gielis states. […]

    By Ivars Peterson

  3. 19251

    This article says that the S waves travel at about one-half the speed of the P waves.