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Helmets are pretty good at keeping irregular shaped objects from cracking your skull, but not as good at stopping concussions. The best a helmet can do if you're sliding along at 20 mph and your head hits a wall is provide an inch or two of distance to slow down and stop your head, instead of it hitting the wall directly. An inch or two is not enough to prevent a concussion in a case like that.
As stated above, it's more dependent on the specifics of the whack to the head than the helmet itself. The idea that our gear will keep us from getting hurt is a fallacy.
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