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  1. Earth

    Young and Restless: Ancient Earth shows moving crust

    The oldest rocks in the world show that Earth's shifting crust began its tectonic movements almost 4 billion years ago.

    By Patrick Barry

  2. Gene predicts sleepy performance

    Variants in a circadian-rhythm gene predict how well people perform mental tasks when sleep deprived.

    By Brian Vastag
  3. Earth

    World’s climate map gets an update

    A century-old system of categorizing the world's climates has been updated to include modern weather data, thereby providing researchers with a tool to better verify results of their computer simulations.

    By Sid Perkins

  4. 19810

    I couldn’t help noticing the last sentence in this article: “One of the system’s 30 possible climate subtypes—a temperate climate with a cold, dry summer—wasn’t found anywhere on Earth.”