Bone marrow: The soft blood-forming tissue that fills the cavities of bones and contains fat and immature and mature blood cells, including white blood cells, red blood cells, and platelets. Diseases or drugs that affect the bone marrow can affect the total counts of these cells.one marrow: The soft blood-forming tissue that fills the cavities of bones and contains fat and immature and mature blood cells, including white blood cells, red blood cells, and platelets. Diseases or drugs that affect the bone marrow can affect the total counts of these cells.
hooks (left) and loops (right). Velcro is a brandname and trademark owned by the Velcro Companies for hook-and-loop fasteners. Hook-and-loop fasteners have a hook side, which is a piece of fabric covered with tiny hooks, and a loop side, which is covered with even smaller and hairier loops.
The inventor of velcro was a Swiss Engineer named George de Mestra who was born in 1907 and died just over 20 years ago in 1990.George de Mestra was a remarkable person, who was an inventor from a very young age.he inventor of velcro was a Swiss Engineer named George de Mestra who was born in 1907 and died just over 20 years ago in 1990.