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  1. Mom’s eggs execute Dad’s mitochondria

    Sperm may tag their own mitochondria for destruction inside the fertilized egg.

    By John Travis
  2. Earth

    Smoggy Asian air enters United States

    High concentrations of ozone from Asia reach the United States.

    By Richard Monastersky
  3. Physics

    Computers Crunch Quantum Collisions

    Physicists have mathematically described what happens when an electron collides with a hydrogen atom, accomplishing a longstanding goal.

    By Oliver Baker

  4. Snooze Power: Midday nap may awaken learning potential

    A brief daytime nap may block or even reverse learning declines that occur during extended practice of a perceptual task.

    By Bruce Bower

  5. 19064

    I found this article enlightening.