How does a helmet prevent brain injuries?
A good helmet provides the brain extra TIME and SPACE to avoid or reduce injuries. First, it is the sudden stop, not the fall, which causes brain injuries. Imagine yourself in a moving bus that comes to a sudden stop. Without a seat belt, your body would keep moving until you hit the back of the seat in front of you or the bus windshield. Imagine this: your brain tissues are like passengers on a moving bus. A good helmet acts like a good driver that gives your brain inside the helmet a little more time, a few taps on the brake, to come to a gentler stop. Secondly, when thumbtacks are used correctly, the wall is pierced, not the thumb. The flat of the thumbtack spreads the force over a broad area of thumb and the sharp point concentrates that same force against a small area of the wall. In the same way, a good helmet spreads concentrated forces from a rock or any irregular impact surface over a broad area of the helmet’s protective liner and the wearer’s scalp and skull. Instead of slic
