Chimpanzees eat smart when it comes to mealtime

Chimpanzees watch what they eat and when, which may show that these primates are giving some thought to the quality of their food, according to Purdue University research.

Evolution may explain 'Runner's high,' study says

(HealthDay) -- The pleasurable feeling known as "runner's high" that's triggered by aerobic exercise may have played a role in the evolution of humans' ability to run long distances, a new study suggests.