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  1. Health & Medicine

    Men line up for circumcision in Africa

    But demand for the operation, shown to guard against HIV and other infections, exceeds availability.

    By Nathan Seppa
  2. Health & Medicine

    Fine-scale structure of egg crucial for fertility

    Scientists describe the shape of a protein required for conception. These new molecular details will lead to an improved understanding of how sperm and egg unite.

    By Laura Sanders
  3. Earth

    Methane even escapes from freezing permafrost

    An extended field season reveals that the autumn freeze in the arctic squeezes methane from some high-latitude wetland soils, a match even for summertime methane release.

    By Sid Perkins
  4. Earth

    Unveiling hidden craters

    Earth is regularly bombarded by small meteorites, but most of the resulting craters are hard to find.