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  1. Math

    Algebraic Hearts

    One of the marvels of mathematics is the way in which an austere equation can unexpectedly blossom into an appealing geometric shape when represented graphically. Cardioid. Picture of an algebraic heart. Gabriel Taubin A heart surface colored according to Gaussian curvature (left) and direction (right). Michael Trott/Wolfram Research A heart-y prime puzzle. Ed Pegg Jr. […]

    By Ivars Peterson
  2. Physics

    Light comes to halt again—in a solid

    By stopping laser light pulses cold in a crystal, storing them, and then releasing them, physicists have achieved the same feat accomplished last year in gases, but this time in a more practical material.

    By Peter Weiss

  3. Unfertilized monkey eggs make stem cells

    Scientists have for the first time obtained long-lived stem cells from monkey eggs stimulated to undergo parthenogenesis.