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  1. Earth

    Limiting Dead Zones

    To limit algal blooms and the development of fishless dead zones in coastal waters, farmers and other sources of nitrate are investigating novel strategies to control nitrate runoff.

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  2. Math

    Theorems for Sale

    In April, an eBay auction offered math enthusiasts the rare opportunity of linking their names with one of the most famous mathematicians of the 20th century.

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  3. Humans

    From the June 2, 1934, issue

    The first chimpanzee twins born in captivity, increased speed and safety for aircraft, and a new pH indicator.

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  4. Math

    Priming Upward

    A singular effort has turned up what is now the largest known prime number.