Radius (bone) ulna (center of the circle) to the edge of the radius (the circle). The ulna acts as the center point to the circle because when the arm is rotated the ulna does not move. In four-legged animals, the radius is the main load-bearing bone of the lower forelimb. Its structure is similar in most terrestrial tetrapods, but it may be fused with the ulna in some mammals (such as horses) and reduced or modified in animals with flippers or vestigial forelimbs. Radius (bone) The radius or radial bone is one of the two large bones of the forearm, the other
Thicker than Water (Only Fools and Horses) Thicker than Water (Only Fools and Horses) "Thicker than Water" is the third Christmas special episode of the BBC sitcom, "Only Fools and Horses", broadcast on 25 December 1983, and is the first to be screened on Christmas Day. The episode title comes from the proverb blood is thicker than water, highlighted by the appearance of Del and Rodney's father, Reg. Rodney and Grandad are watching television on Christmas Day, when a stranger appears at the door. The stranger turns out to be Del Boy and Rodney's father (and Grandad's son) Reg, who had abandoned them 18 years earlier after