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  1. Health & Medicine

    Looking Ahead: Tests might predict Alzheimer’s risk

    Two tests show promise in detecting Alzheimer's disease or other cognitive impairment years before symptoms arise.

    By Nathan Seppa

  2. Model for Madness: Engineered mice have schizophrenia-like symptoms

    Scientists have genetically altered mice so that they mimic the deficits in short-term memory and attention of schizophrenic patients.

    By Christen Brownlee
  3. Animals

    Killer Flatworm: New species hunts with puffer fish toxin

    A newly described marine flatworm from Guam hunts with the same toxin that a puffer fish uses. With video.

    By Susan Milius
  4. Health & Medicine

    Not So Sweet: Cancers in rats that consumed aspartame

    A large, new study in rats suggests that the artificial sweetener aspartame may be a carcinogen, but critics question the finding's validity.