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  1. Health & Medicine

    Nervous tics in the heart

    The irregular heartbeats sometimes triggered after a heart attack may be caused by abnormal nerve growth in heart tissue damaged by the attack.

    By Damaris Christensen
  2. Health & Medicine

    Waiting to exhale

    A breath test that measures the activity of an enzyme involved in breaking down drugs in a person's body may help doctors minimize side effects from potent drugs such as docetaxel.

    By Damaris Christensen
  3. Astronomy

    New views of Jovian moons

    The Galileo spacecraft has taken the highest-resolution images ever recorded of three of Jupiter's small, innermost moons.

    By Ron Cowen
  4. Astronomy

    Galaxies shine light on dark matter

    Using a cosmic mirage known as gravitational lensing, astronomers have developed detailed maps of the distribution of dark matter, the invisible material believed to make up 90 percent of the mass of the universe.