Here's another consideration about helmet safety that I don't recall being mentioned on this site...
It's from this article
where the authors argue that helmets meeting the Snell standard tend to be too stiff, leading to excessive head acceleration. But they also say...
If you're hit very violently on the jaw, as in a head-on impact, the force can be transmitted to the base of the skull, which can fracture and sever your spine. It's a common cause of death in helmeted motorcycle riders—and a very good reason to wear a full-face helmet and insist on thick EPS padding—not resilient foam—in the helmet's chin bar.
My helmet has resilient (bouncy, not energy absorbing) foam here.
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