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  1. Earth

    Ghostly white northern lights present new auroral mystery

    These mysterious whitish-gray glows in the northern lights might be cousins of the mauve light streak known as STEVE.

    By Maria Temming
  2. Astronomy

    A cosmic ‘Platypus’ might link two astronomical mysteries

    A flash of light called the Platypus has hallmarks of a mid-sized black hole shredding a star and a type of burst thought to be a stellar explosion.

    By Lisa Grossman
  3. Animals

    Fever’s link with a key kind of immunity is surprisingly ancient

    When sick, Nile tilapia seek warmer water. That behavioral fever triggers a specialized immune response, hinting the connection evolved long ago.

    By McKenzie Prillaman
  4. Earth

    Another danger looms after the LA fires: Devastating debris flows

    As wildfires burn the landscape, they prime slopes for debris flows: powerful torrents of rock, mud and water that sweep downhill with deadly momentum.