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  1. Gene predicts sleepy performance

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

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  2. 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.

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  3. 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.” The comment reveals that the writer has never read Mark Twain’s comment that the coldest winter he ever spent was a summer in San Francisco.