Crunch. Creak. Ouch. That's what your poor, overworked shoulders grumble at you. Get to "aah" and "thanks" with good info and a few life tweaks.
- Three bones make up the shoulder: the scapula, humerus, and clavicle.
- The shoulder can rotate 270 degrees — the most of any joint in the body.
- Human pitches can hit 100 mph; no other animal can throw as fast. When chimps are trained to throw, they max out at around 20.
- It took for 4 million years for the shoulders and core to evolve so we could reach back and throw — an essential skill for hunting.