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  1. Math

    Riding on Square Wheels

    A square wheel can roll smoothly if it travels over a roadway of the right geometric shape.

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  2. Earth

    Night space images show development

    Scientists may have come up with a way to use satellite images taken at night to estimate the rate of population growth in fire-prone areas and thereby better assess fire risk to specific groups of residents.

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  3. 19400

    Using laser technology that has an apparent resolution of only about half a centimeter is somewhat laughable. I also wondered whether the “fresh coat of desert varnish” was an April fool joke. Actually, I really look forward to every new issue.