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  1. Paleontology

    Tusk analyses suggest weaning took years

    Changes in the proportions of various chemical isotopes deposited in mammoth tusks as they grew have enabled scientists to estimate how long it took juvenile mammoths to become fully weaned.

    By Sid Perkins
  2. Paleontology

    Mmmm, that’s crunchy

    Isotopic analyses of the teeth of otters and mongooses from Africa have led one paleontologist to suggest that some of humanity's ancient kin shared those modern animals' preference for shelled prey such as freshwater crabs and snails.

    By Sid Perkins
  3. Physics

    Revisiting Einstein’s incomplete theory

    New, ultraprecise measurements of single-particle trajectories confirm that there's something missing from Einstein's mathematical model for Brownian motion.

    By Peter Weiss
  4. Health & Medicine

    A toast to thin blood

    Moderate consumption of alcohol may make a person's blood less likely to clot.