John Wesley Powell led the first expedition down the Grand Canyon in 1869. He was the first to use the name "Grand Canyon" after it had previous been known as the "Big Canyon" or "Great Canyon".
German Shepherds are the dogs which are often seen working with the police force. This is due to their high intelligence levels, desire to explore their surroundings, courage, agility and loyalty.
The human skeletal system has six major functions including the production of blood cells, for support, for movement, for protection, for storage of ions and endocrine regulation.