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  1. Animals

    Frog ribbits erupt via an extravagant variety of vocal sacs

    Shape matters as well as size in the great range of male frog show-off equipment for competitive seductive serenades.

    By Susan Milius
  2. Astronomy

    A gas cloud 5,500 times as massive as the sun lurks nearby

    At 300 light-years away, the interstellar cloud is the closest of its kind ever found to Earth and the largest apparent single structure in the sky.

    By Mara Johnson-Groh
  3. Climate

    Losing a key U.S. climate report would hurt future disaster prep

    A scientist who worked on the National Climate Assessment explains how stopping work on it may make us more vulnerable to extreme weather disasters.