A Marine carry team lifts a transfer case containing the remains of Cpl. Paul J. Miller at Dover Air Force Base, Del., on July 21. Miller, of Traverse City, Mich., was killed by a roadside bomb blast while on patrol in Afghanistan. July was the deadliest month for U.S. troops in the nearly nine-year-old war.
The human shoulder (above) allows the arm to hang freely and enables us to flex the arm at the elbow and perform tasks in front of us with ease. Because of its location and structure, the human arm is great for throwing. The ape shoulder (below), by contrast, allows for a different range of motion and is more suited to hanging from trees.