Originally Posted by madcalicojack

Perhaps you didn't state it explicitly, but it is certainly implied... and wrong.

None of the articles here directly examine the efficacy of a helmet to prevent severe head injury in the event of a fall. Each of them examines the efficacy of mandatory helmet laws on reducing injuries. Incidentally because I believe we are all adults capable of making our own decisions, I oppose mandatory helmet laws. I really don't intend to continue a pissing match, but the half-million foot*pound argument is bad science, and I wanted to identify it for the benefit of the original poster. Since you are now saying that you never said that helmets have to absorb this amount of energy to be effective, I think the error is corrected.

Good day.