If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker mucus because of the tar or other toxic ...

This cold and flu season, you may be looking for clues you're getting better anywhere you can find them, even in the color of your snot.

In the rocky intertidal coves of northern Australia, a squishy creature secretes sticky mucus when threatened. Shared by Benoît Dayrat On the rocky coasts of northwestern Australia, small coves ...

Every surface in our bodies not covered in skin is lined with a protective layer of mucus — a slimy network of proteins that acts as a physical barrier against bacteria and other infectious agents. In ...