1. The difference between running and walking is that running involves a period of time whereby neither foot is in contact with the ground. This period of time is know as the flight phase.
2. The cause of pain isn't always in the area where you feel the pain.
3. Breaks and fractures are actually the same thing when referring to bones.
4. When a joint is sprained, it never completely returns to its pre-injury state.
5. Some people can have an extra rib coming of their neck vertebrae!
