Feature

  1. Astronomy

    Dead — but not duds

    White dwarfs shed light on physics and the fate of the cosmos.

    By Ashley Yeager
  2. Astronomy

    Last Call

    The final mission to service the Hubble Space Telescope could radically transform the observatory, but the crew faces some special challenges.

    By Ron Cowen
  3. Neuroscience

    Breaking the Barrier

    A technique combining ultrasound pulses with microbubbles may help scientists move therapeutic drugs across the brain’s protective divide.

    By Tia Ghose
  4. Life

    Sting Operation

    Scientists use bees and wasps to sniff out the illicit and the dangerous.

    By Susan Gaidos

  5. Potent Promise: Essential Stemness

    Scientists move closer to understanding the dual fates of embryonic stem cells — to divide or develop.