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  1. Chemistry

    An inexpensive catalyst generates hydrogen

    A new, inexpensive catalyst could make hydrogen generation cleaner.

    By Jessica Gorman
  2. Anthropology

    Lucy’s kind takes humanlike turn

    A new analysis of fossils from a more than 3-million-year-old species in the human evolutionary family reveals that the males were only moderately larger than the females, a finding that has implications for ancient social behavior.

    By Bruce Bower
  3. Paleontology

    Learning from the Present

    New field studies of unfossilized bones, as well as databases full of information about current fossil excavations and previous fossil finds, are providing insights into how complete—or incomplete—Earth's fossil record may be.

    By Sid Perkins
  4. Astronomy

    Supernova Spectacular

    Studying starburst galaxies, relatively nearby galaxies that are undergoing a tremendous rate of star formation, may reveal how elliptical galaxies arose and black holes grew in the early universe.