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  1. Health & Medicine

    Stressed-out DNA turns mousy brown hair gray

    Scientists show how change happens when cells responsible for colorful hair lose their self-renewing abilities.

    By Laura Sanders
  2. Space

    Alien visitor from afar

    A speedy stellar neighbor may be a refugee from another galaxy.

    By Ron Cowen
  3. Space

    Betelgeuse shrinks

    A familiar star, visible to the naked eye, has shrunk dramatically in just 15 years.

    By Ron Cowen
  4. Health & Medicine

    Tuberculosis bacterium subverts basic cell functions

    The tuberculosis microbe makes compounds that alter basic systems inside key immune cells, facilitating the bacterium’s survival in the body, new research shows.

    By Nathan Seppa
  5. Planetary Science

    Solar system’s future could be bumpy

    A new study assesses the chances that two planets will collide or a planet will plunge into the sun in the next 5 billion years.