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  1. 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
  2. Earth

    Unveiling hidden craters

    Earth is regularly bombarded by small meteorites, but most of the resulting craters are hard to find. A team reports finding one such crater in the forests of west-central Alberta.

    By Sid Perkins
  3. Health & Medicine

    Protein found to set the heart’s cadence

    Researchers have discovered a molecular metronome that sets the rhythm of the heart and blood pressure.

    By Tina Hesman Saey
  4. Math

    Florence Nightingale: The passionate statistician

    Florence Nightingale pioneered the use of applied statistics to develop policy and developed novel ways of displaying them.