Commonly comprised of dirt, pollen, skin cells, insects, pet dander, mold spores, bacteria, mycotoxins, dust mites, their refuse, and other such flotsam and jetsam, the buildup of indoor and outdoor ...

When marathon runners hit the wall or fall behind their goal pace, they often blame fatigue, weather or nutrition. However, a ...

Marathon runners consistently finished slower in cities with higher levels of dangerous particles in the air, researchers found.