Safety always involves compromises. A helmet that could protect completely against every impact might be huge. A strong strap that keeps the helmet in place in a crash may strangle a child catching that helmet in the monkey bars on a playground. Helmets are designed to keep expected impacts within the range of human brain tolerance. But what if the brain is in a senior citizen and has become more brittle and less flexible, or what if it has already been injured in the past and is easier to re-injure? Or what if it is just more fragile than the average due to hereditary factors? Current helmet standards do not even attempt to address this problem. Concussions are reduced, but still acceptable as long as catastrophic injuries are reduced. Eliminating the crash or eliminating hard objects in the crash environment may be a more effective means of addressing a head injury problem than wearing a helmet. The benefits of that approach extend to those other parts of the body that a helmet does not even attempt to protect.
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