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  1. 19257

    After reading your article, I am sure others must have also wondered if the “Tunguska meteor” that struck in Siberia in June 1908 might have been a mirror meteor. The mirror-asteroid strike described in the article sounds very much like descriptions of the event: tremendous energy and no impact crater. If a mirror object were […]

    By Science News
  2. Physics

    Through the Looking Glass

    A proposed universe of unseen material, where every ordinary particle has a shadowy counterpart, could explain several conundrums in cosmology.

    By Ron Cowen
  3. Anthropology

    The Forager King

    A celebrated anthropologist surprises and inspires his biographer.

    By Bruce Bower
  4. Animals

    Strange Y chromosome makes supermom mice

    An otherwise rare system of sex determination has evolved independently at least six times in one genus of South American mice.