News

  1. Chemistry

    Guards of the blood-brain barrier identified

    Specialized cells called pericytes are crucial to protecting the central nervous system, two new studies demonstrate.

    By Rachel Ehrenberg
  2. Life

    More than a chicken, fewer than a grape

    A decade after the completion of the Human Genome Project, the exact number of human genes remains elusive.

    By Tina Hesman Saey
  3. Space

    CSI: Asteroid Belt

    Astronomers hunt clues in the rubble of a recent collision between two space rocks.

    By Ron Cowen
  4. Life

    New species a little nipper

    A mongoose-like creature from Madagascar is the first new carnivore to be discovered in more than two decades.