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  1. Chemistry

    New sensor can ID dangerous bacteria

    When newly created organic molecules, called TWTCPs, are attached to a porous silicon wafer and exposed to a certain class of bacterium, the wafer changes color.

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  2. Leonardo’s Bridge

    In 1502, Leonardo da Vinci made a simple drawing of a great, 240-meter bridge that was to span an inlet at the mouth of the Bosporus River in what is now Turkey. The bridge was never built, but Leonardo’s design has been reproduced in a wooden bridge for pedestrians over a highway in Norway. Artist […]

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  3. Health & Medicine

    The Science of Secretin

    The discovery that a gut hormone also exists in the brain may shed light on the origins of autism.