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

  1. Brain

    Hunger’s little helpers

    Astrocytes were thought to be nothing more than support cells for neighboring nerve cells. A new study suggests they do much more. These brain cells may help control appetite, too.

  2. Health & Medicine

    For better weight control, fiber up!

    Certain types of fiber suppress appetite, at least in mice. Found in fruits, vegetables, oats and barley, this fiber breaks down in the gut to release acetate. That travels to the brain, where the chemical prompts the release of hunger-fighting hormones.

  3. Animals

    Kangaroos have ‘green’ farts

    The farts and belches of these animals contain less methane than do those from other big grass grazers. Microbes in their digestive tract appear to explain the ‘roos lower production of this greenhouse gas, a new study finds.

  4. Health & Medicine

    Teen finds the ‘shape’ of our beating hearts

    Kevin Lee used math to probe how the shape of a beating heart relates to electrical signals from the brain. He unveiled it at the 2014 Intel Science Talent Search.

  5. Health & Medicine

    Simple test for cancer and heart disease

    Disease diagnosis often requires expensive equipment and tests to probe deep inside the body. But a new test relies on a fast, cheap and easy technique. And its answers appear on a strip of paper — just as they do on a pregnancy test.

  6. Animals

    Dissecting the dog paddle

    Scientists occasionally describe the dog paddle as a “trot,” but that’s not right. When dogs swim, their complicated leg motions look more like a frantic run.

  7. Life

    Explainer: What is a stem cell?

    Special cells have ability to turn into several different types

  8. Brain

    Explainer: Our bodies’ internal clocks

    Biological clocks determine hunger, sleepiness and other daily rhythms.

  9. Health & Medicine

    Blood does a body good

    Studies of the superfluid aid in the prevention and treatment of diseases.

  10. Animals

    Dolphin dimples detect electricity

    Depressions in a dolphin’s snout sense electric fields, may help find dinner.

  11. Animals

    Secrets of the world’s extreme divers

    For emperor penguins and other animals, being able to hold their breath the longest could be in the blood

  12. Health & Medicine

    Fat weighs heavy on the brain

    New study shows obesity interferes with memory, thinking and reasoning.