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 ...

The spheres, made from volcanic basalt and lapilli, were discovered across eight archaeological sites in Melka Kunture, dated ...

The Atapuerca Mountains in northern Spain are home to the Sima de los Huesos, or "Pit of Bones," which has offered one of the ...