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  1. Agriculture

    Killer bees boost coffee yields

    Even self-pollinating coffee plants benefit substantially from visits by insect pollinators.

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  2. Caregivers take heartfelt hit

    Older persons experience elevated systolic blood pressure for at least 1 year after a spouse with Alzheimer's disease enters a nursing-care facility or dies.

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  3. Materials Science

    Spring in your step? The forces in cartilage

    Researchers are uncovering the role of molecular forces in cartilage's ability to resist compression.

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  4. Health & Medicine

    Appetite-suppressing drug burns fat, too

    An experimental drug seems to assail obesity through dual biological actions.

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  5. Physics

    Double or Nothing

    The hunt for a rare, hypothetical nuclear transformation known as neutrinoless double-beta decay may answer one of the most urgent questions in physics today: How much do elementary particles called neutrinos weigh?

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  6. Aphids with Attitude

    A few aphid species that live socially in groups raise their own armies of teenage female clones.

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  7. From the July 2, 1932, issue

    OUR FRIEND THE BAT With the coming of warm summer weather, and the arrival in number of insects to eat, bats are becoming more noticeable as they make their noiseless nightly patrols. Because of their nocturnal, and therefore mysterious, habits and because of their preference for homes in caves and dark holes, our ancestors came […]

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  8. Ketchup’s Shear Mystery

    Shifting suddenly from a thick paste to a runny liquid when shaken or jarred, ketchup is one of many complex fluids that share a property called “shear thinning.” A NASA Web page highlights an upcoming space experiment aimed at elucidating the basic physics of these fluids. Go to: http://science.nasa.gov/headlines/y2002/07jun_elastic_fluids.htm

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  9. Math

    Dangerous Problems

    Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve. Nonetheless, despite their reputed difficulty and repeated warnings from those who had failed to solve them in the past, these infamous problems continue to lure mathematicians into hours, days, and even years of futile labor. Billiard-ball trajectory after 15 […]

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  10. Math

    Dangerous Problems

    Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve. Nonetheless, despite their reputed difficulty and repeated warnings from those who had failed to solve them in the past, these infamous problems continue to lure mathematicians into hours, days, and even years of futile labor. Billiard-ball trajectory after 15 […]

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  11. Math

    Dangerous Problems

    Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve. Nonetheless, despite their reputed difficulty and repeated warnings from those who had failed to solve them in the past, these infamous problems continue to lure mathematicians into hours, days, and even years of futile labor. Billiard-ball trajectory after 15 […]

    By
  12. Math

    Dangerous Problems

    Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve. Nonetheless, despite their reputed difficulty and repeated warnings from those who had failed to solve them in the past, these infamous problems continue to lure mathematicians into hours, days, and even years of futile labor. In a presentation this […]

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