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  1. Health & Medicine

    Smart microbes

    Bacteria are smarter than you might think. Single-celled microbes can learn to predict changes in their environments and prepare themselves.

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  2. Climate

    A little drier every day

    The Sahara, one of the hottest and driest regions on Earth, gradually became arid over a period of centuries, a finding that contradicts many previous studies.

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  3. Life

    Risky nests

    Invasive species misleads birds picking a home.

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  4. Space

    A new look at the gamma-ray sky

    Explosions pouring out as much energy in seconds as the sun does in its entire lifetime. Invisible beams of radiation sweeping across the sky like giant searchlights.