HS-LS1-2
Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- Life
Explainer: What is a stem cell?
Special cells have ability to turn into several different types
- Brain
Explainer: Our bodies’ internal clocks
Biological clocks determine hunger, sleepiness and other daily rhythms.
- Health & Medicine
Blood does a body good
Studies of the superfluid aid in the prevention and treatment of diseases.
- Animals
Dolphin dimples detect electricity
Depressions in a dolphin’s snout sense electric fields, may help find dinner.
- 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
- Health & Medicine
Fat weighs heavy on the brain
New study shows obesity interferes with memory, thinking and reasoning.
