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  1. Animals

    True-pal lizards may show odd gene

    Colorful lizards in California may offer an example of a long-sought evolutionary factor called greenbeard genes, a possible explanation for altruism.

    By Susan Milius
  2. Health & Medicine

    Hookworms hitched rides with nomads

    Horseback-riding herders known as Scythians once traveled far and wide across Eurasia, and their remains contain the parasites to prove it.

    By Ben Harder
  3. Health & Medicine

    Many people don’t see well

    Vision screening of a broad sample of people in the United States ages 12 and older finds that 6.4 percent of them have substandard vision.

    By Nathan Seppa
  4. Planetary Science

    The sands of Titan

    Although the surface of Saturn's moon Titan is cold enough to freeze methane, it has sand dunes like those in the Arabian Desert, according to radar images taken by the Cassini spacecraft.