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  1. Uncertainty fires up some neurons

    In monkeys, a small set of brain cells that transmit the chemical messenger dopamine to various neural destinations works as an uncertainty meter.

    By Bruce Bower

  2. After West Nile Virus

    As biologists try to estimate the impact of West Nile virus on wildlife, it's not the famously susceptible crows that are causing alarm but much rarer species.

    By Susan Milius
  3. Earth

    When do EMFs disturb the heart?

    Whether electromagnetic fields can blunt the healthy variability in heart rate may depend on an exposed individual being aroused or stressed during exposure.

    By Janet Raloff
  4. Earth

    Methylmercury’s toxic toll

    More than 60,000 children are born each year with neurodevelopmental impairments due to their prenatal exposure to methylmercury.