A common piece of advice you may have heard is to never let your knee move forward beyond the front of your foot. This is well-meaning, but not actually true.
Learn about the exciting life cycle of cracks! From infant little microfractures to all grown up break-my-new-feder cracks.
Healing broken bones is fairly routine in modern medical practice, but a brain injury is a completely different story. The physics behind what causes concussions, and why they are fundamentally different from injuries as we are used to thinking about them.