helmet

A robust strap that keeps the helmet in place in a crash might strangle a kid catching that helmet in the monkeybars 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 grow to be additional brittle and less versatile, or what if it has already been injured in the previous and is simpler to re-injure? Or what if it is just much more fragile than the average due to hereditary things? So even if there are no visible indicators of...