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  1. Earth

    The Making of a Grand Canyon

    Carving this beloved hole in the ground may not have been such a long-term project.

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  2. 19347

    I read and reread this article, hoping to find an explanation of where all those sediments have gone. From appearances, they surely all haven’t been deposited in the Gulf of California. Where else? Does anyone have any satisfying theories? Allen Glenn Abilene, Texas Sediments from the erosion of the Grand Canyon have ended up in […]

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  3. Computing

    Virtual stampede sees faces in crowd

    A new computer model based on particle interactions suggests ways to prevent a panicked crowd from stampeding.

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  4. Physics

    One-molecule chemistry gets big reaction

    Carrying out a widely used chemical reaction on one molecule at a time, researchers demonstrate unprecedented control of molecular behavior and, possibly, the ability to make novel nanotechnology devices and compounds that can't be created with ordinary chemistry.

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  5. Plants

    Glitch splits hermaphrodite flowers

    In a newly proposed scenario, polyploidy may trigger perfectly good hermaphrodite plants to evolve gender forms.

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  6. Astronomy

    Craft finds where sun’s corona gets its hots

    New findings may help explain an enduring solar riddle: Although the sun's outer atmosphere lies thousands of kilometers above the visible surface of the sun, it's about 1,000 times hotter.

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  7. Health & Medicine

    Insulin inaction may hurt even nondiabetics

    Flawed insulin activity may lead to blood changes that foster atherosclerosis, even in people who don't have diabetes.

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  8. 19346

    Your article says elevated concentrations of glucose in the blood is “a problem that occurs downstream” of impaired response to insulin. Yet artery blockage is defined as a failure of cells to react to insulin. So, would not the problem be upstream of the impairment? Marry Morel Prescott, Ariz. Downstream of the impairment, here, means […]

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  9. Memory echoes in brain’s sensory terrain

    The process of remembering an event reactivates brain regions that were involved in initially seeing or hearing the event.

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  10. Earth

    Model offers grounds for midwestern quakes

    A new computer model may help explain how earthquakes can happen at fault zones located far from the edges of a tectonic plate.

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  11. Health & Medicine

    Gene Tied to Heightened Diabetes Risk

    People with three particular variations within the gene that encodes the protein calpain-10 face triple the risk of getting type II diabetes.

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  12. Math

    Trimathlon Palindromes

    “A man, a plan, a canal–Panama.” This statement is a famous example of a palindrome–a phrase that reads the same forward or backward. Inventive wordsmiths and puzzlists have come up with all sorts of words, sentences, and even paragraphs that have this property. The term palindrome can also be applied to whole numbers, such as […]

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