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  1. Animals

    Why don’t racing horses fry their brains?

    Lumpy sacs bulging out of a horse's auditory tubes may solve the mystery of how such an athletic animal keeps its brain from overheating during exercise.

    By Susan Milius
  2. Earth

    Major mood swing alters Pacific character

    The temperature of the North Pacific Ocean has apparently veered from one extreme to the other—a change that could alter North American weather for the next decade or two.

    By Richard Monastersky
  3. Health & Medicine

    Meaty receptor helps tongue savor flavor

    Scientists have identified a receptor protein in taste buds that recognizes the flavor of monosodium glutamate.

    By Tina Hesman Saey
  4. Health & Medicine

    New Compounds Inhibit HIV in Lab

    Two new compounds uncovered by pharmaceutical scientists block integrase, an enzyme essential to the replication cycle of the virus that causes AIDS.