Feature

  1. Earth

    Pinning Down the Sun-Climate Connection

    Many scientists propose that changes in the sun's magnetic field and radiation output during its 11-year sunspot cycle also affect the atmosphere, changing Earth's climate by steering weather systems and influencing the amount of cloud cover.

    By Sid Perkins
  2. Physics

    Magnetic Whispers

    Promising new ways to magnetically probe tissues and substances are emerging now that a small research group has proved their once-ridiculed claim of a flaw in the 50-year-old theory behind magnetic resonance imaging (MRI) and similar analytic techniques.

    By Peter Weiss
  3. Health & Medicine

    Mending a Broken Heart

    Transplants of skeletal-muscle cells may help heal hearts damaged by illness or previous heart attacks.