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  1. Paleontology

    Signs of red pigment were spotted in a fossil for the first time

    For the first time, scientists have identified the chemical fingerprint of red pigment in a fossil.

    By Carolyn Gramling
  2. Animals

    Bad moods could be contagious among ravens

    Ravens may pick up and share their compatriots’ negativity, a study on the social intelligence of these animals suggests.

    By Carolyn Wilke
  3. Physics

    The kilogram just got a revamp. A unit of time might be next

    After years of preparation, new definitions for the basic units of mass, temperature and more have now gone into effect.

    By Emily Conover
  4. Paleontology

    This early sauropod went from walking on four legs to two as it grew

    A new computer analysis shows how Mussaurus patagonicus' center of gravity changed as the dinosaur grew.