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  1. Astronomy

    Cosmic Revelations: Satellite homes in on the infant universe

    A new portrait of the infant universe pins down the age of the universe—13.7 billion years—to an unprecedented accuracy of 1 percent, provides new evidence that the universe began with a brief but humongous growth spurt, and reveals that it already contained a plethora of stars when it was just 200 million years old.

    By Ron Cowen

  2. Gene found key to brain chemical

    The mammalian brain makes the neurotransmitter serotonin in an unexpected way.

    By John Travis
  3. Health & Medicine

    Worms offer the skinny on fat genes

    The identification of worm genes that regulate fat storage may provide insight into human obesity.