The human body contains enough iron to make a spike strong enough to hold your weight. In the early Twentieth century, rattlesnake venom was used to treat epilepsy. The human body contains about sixty thousand miles of blood vessels.
Iron deficiency causes the most common form of anaemia.
Red blood cells are produced in the bone marrow. The smallest bone in the body is the stirrup bone. The red dye cochineal comes from the dried bodies of scale insects. Soap was originally made by boiling fat and adding lye to it. The active ingredient in smelling salts is ammonia.