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 original patented hook and loop fastener was invented in 1948 by the Swiss electrical engineer George de Mestral, who patented it in 1955 and subsequently refined and developed its practical manufacture until its commercial introduction in the late 1950s.mong them is a series of mechanical-based fastening products, including a brand of fabric hook and loop fastener often colloquially referred to by the company name, Velcro.