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  1. Paleontology

    Fossilized poop bears tooth marks

    Shark-bitten fecal matter probably came from an assault on an ancient croc.

    By Sid Perkins
  2. Physics

    Superchilly chemistry

    New theory and experiments help reveal how molecules interact in an ultracold system.

    By Laura Sanders
  3. Anthropology

    Farming’s rise cultivated fair deals

    A cross-cultural study suggests that the spread of farming unleashed a revolution in concepts of fairness and punishment.

    By Bruce Bower
  4. Physics

    How to hide a bump with some logs

    Physicists take a step toward true invisibility with a cloak that makes objects invisible from multiple points of view.

    By Lisa Grossman
  5. Physics

    Next on CSI: Surface-enhanced Raman spectroscopy

    The modification of a powerful chemical analysis technique could make it the gold standard in detecting trace substances.