Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

  1. Health & Medicine

    Injected nanoparticles treat internal wounds

    Soldiers wounded in a bombing could be treated with a shot of specially designed nanoparticles that stop bleeding and inflammation in the lungs.

  2. Microbes

    New virus may have given kids polio-like symptoms

    More than 100 U.S. children developed a paralyzing illness in 2014. Genetic evidence now suggests that the most likely culprit is a new form of a virus in the polio family.

  3. Health & Medicine

    Peanuts for baby: A way to avoid peanut allergy?

    Making peanut products a baby food could head off life-threatening peanut allergies later, new data show.

  4. Health & Medicine

    Vision-ary high tech

    New devices are being developed to improve, restore or preserve the vision of people with eye diseases, such as glaucoma and macular degeneration. One device is a telescopic contact lens than can be zoomed with a wink.

  5. Health & Medicine

    Scientists say: Inflammation

    When cells are injured, they send out distress signals. The rescuing cells cause more blood to flow to the area, producing inflammation.

  6. Environment

    Nano air pollutants strike a blow to the brain

    Most people think that air pollution poses the biggest risk to our lungs. In fact, pollution hits the brain too, sometimes by traveling a direct route — through our noses. These tiny pollutants can harm IQ and more.

  7. Brain

    Scents may affect how appealing tobacco is

    Menthol’s effects on the brain may make tobacco more addicting. In contrast, foul odors might help smokers quit. Two new studies show how.

  8. Health & Medicine

    The secret of fast runners: symmetry

    Science had shown that animals and people with symmetrical bodies tend to be stronger and healthier. Now researchers find they can predict the best sprinters by measuring the top runners’ knees.

  9. Animals

    Germs explain some animal behaviors

    The bacteria that people and other animals host in and on their bodies are invisible to the eye. Yet they can play a very visible role in behavior. It’s something scientists are just coming to appreciate.

  10. Animals

    Elephants appear to be super sniffers

    Elephants are not only massive, but also possess the most odor-detecting genes of any animal known, new research shows.

  11. Health & Medicine

    Young blood: The elixir of youth?

    Old mice show improved memory when blood from young mice circulated through their brains, a new study finds. Other studies suggest one ingredient in that young blood might be all it takes to deliver benefits.

  12. Science & Society

    Dissect a frog and keep your hands clean

    Dissecting frogs can be a fun and useful way to learn about anatomy. If you don’t have a frog on hand, here are three smartphone apps that allow you have your frog legs and dissect them, too.