Sea turtles migrating across the Pacific stick to narrow paths that persist from year to year. How the brain knows when eating must stop A novel form of nerve talk may allow the brain to track, from the gut, the consumption of different types of nutrients. Risky sex breeds neglected epidemic The United States has failed to respond to an epidemic of sexually transmitted diseases, even though the country's infection rates dwarf those of every other developed country, the Institute of Medicine asserts. No proof found so far Two new studies have found a conspicuous lack of deaths or hospitalizations resulting from exposures to chemical weapons among veterans of the Persian Gulf War. Some athletes may suffer heart damage after prolonged, extremely arduous exertion.
Deer hunting can put men with clogged arteries at risk of a heart attack.
A mutated gene that causes Parkinson's disease exists in a narrow region on the long arm of chromosome 4. Because cancer cells often lack a protein called p53, scientists are trying to develop a virus that will kill tumor cells but ignore normal cells, which normally do have p53. Huntington's disease strikes mice By adding to mice a small portion of the human gene that causes Huntington's disease, researchers have created animals they hope will reveal how the mutant gene kills brain cells. Protecting Predators Tracking the Rocky Mountain carnivores Wildlife biologists are examining the viability and resiliency of large carnivores to determine how best to ensure the animals' long-term survival. Though they make up only a tiny fraction of a galaxy's stellar population, massive stars have a profound, and often destructive, influence on their neighbors.