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  1. Life

    Neandertal relative bred with humans

    Known only through DNA extracted from a scrap of bone, a Siberian hominid group suggests a much more complicated prehistory for Homo sapiens.

    By Laura Sanders
  2. Space

    South Pole neutrino detector complete

    Scientists lower the last of more than 5,000 sensors into the Antarctic ice, completing the mile-deep IceCube observatory.

    By Marissa Cevallos
  3. Life

    Genes separate Africa’s elephant herds

    Genetic work reveals forest and savanna pachyderms as distinct species.

    By Tina Hesman Saey
  4. Humans

    Periodic table gets some flex

    IUPAC committee replaces fuzzy atomic weights with more accurate ranges

    By Rachel Ehrenberg
  5. Space

    Space rock surprise

    Meteorite analysis suggests it may be possible to make amino acids in the absence of water, boosting the chances of finding life elsewhere in the universe.