In your body, you have only two types of bone tissue: cortical and cancellous bone. In this lesson, we will learn about the structure and function of cancellous bone, which plays a crucial role in producing blood cells and stem cells and is the primary tissue affected by osteoporosis.
balaclava (plural balaclavas) 1  A warm cap shielding the neck and head, often made out of wool. ( 2 chiefly Canada) A ski mask with holes for the eyes and, sometimes, the nose and mouth, which may be rolled up and worn like a toque or pulled over the face for greater protection.
The Triclops is a promotional cosmetic item for the Pyro. It is a half black, half team-colored mask with three glowing team-colored eye-holes for it, based on the Assassin's mask from the game Super Monday Night Combat. It is awarded to players who complete the All-Star Agent achievement in Super Monday Night Combat. This cosmetic item has two styles, named Roasting and Blazing. The Blazing style makes the hat's texture reflective.