Uncategorized

  1. Math

    Coins for Making Change Efficiently

    The item I had just bought cost 29 cents. I gave the cashier a dollar bill, and she gave me two quarters, two dimes, and a penny in change. She could just as well have given me seven dimes and a penny or some other combination of coins adding up to 71 cents, but there’s […]

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  2. 19320

    This article could have been a little less disingenuous. It would still have been a very good article if you had used “sulfuric acid” instead of “odorless hydrogen sulfate” and admitted that the process still required a little alkali to neutralize this waste stream that is “carried away by water trickling over the foam.” Jim […]

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  3. Tech

    A Breath of Fresh Air: Bacteria rid sewage of its stink

    Wastewater-treatment plants can use hydrogen sulfide-degrading bacteria instead of chemicals to reduce odors.

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  4. Harvesting Intelligence: IQ gains may reach rural Kenya’s kids

    Researchers say they've uncovered a dramatic IQ increase among Kenyan children over a recent 14-year period that may be due to environmental factors such as better nutrition and a greater parental emphasis on schooling.

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  5. 19319

    Your article says, correctly, that our research group performed ultrasound of the main blood vessel of the women’s arms as a measure of vessel-cell function throughout the body. However, we identified women at risk of preeclampsia by performing ultrasound tests to assess blood-flow restriction of arteries in the uterus during the second trimester of pregnancy. […]

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  6. Health & Medicine

    Preeclampsia Progress: Blood test for predicting pregnancy problems

    A natural compound called asymmetric dimethylarginine (ADMA) may play a role in preeclampsia, a pregnancy complication.

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  7. Materials Science

    Nanofluid Flow: Detergents may benefit from new insight

    Fluids containing nanoscale particles spread and readily lift oil droplets off a surface.

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  8. Paleontology

    Winging South: Finally, a fly fossil from Antarctica

    A tiny fossil collected about 500 kilometers from the South Pole indicates that Antarctica was once home to a type of fly that scientists long thought had never inhabited the now-icy, almost insectfree continent.

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  9. Earth

    Farm Harm: Ag chemicals may cause prostate cancer

    On-the-job exposure to certain agricultural chemicals may be responsible for farmers' high rates of prostate cancer.

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  10. Astronomy

    Starry View: Image reveals galaxy’s violent past

    The most detailed visible-light picture ever taken of the heavens reveals that the nearby Andromeda galaxy has had a much more violent history than our own Milky Way has.

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  11. Anthropology

    Ancestral split in Africa, China

    Environmental conditions may have encouraged Homo erectus to develop a level of social and tool-making complexity in Africa that the same species did not achieve in China.

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  12. Anthropology

    Wari skulls create trophy-head mystery

    A 1,000-year-old Peruvian site has yielded the remains of decapitated human heads that were used as ritual trophies but, to the researchers surprise, did not come from enemy warriors.

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