• From what he says, it's not clear if the frontal lobe damage was from hitting the road, or rebound from the initial impact. But anyway it clearly indicates that a helmet isn't complete protection.

    What would really have happened if he hadn't been wearing a helmet? Would the blow have dashed out his brains? Would a sharper impact have put more of the energy into damaging the wing mirror? Would the blow have connected as solidly or at all? Would the truck driver have given him a wider berth if he'd looked more vulnerable?

    I still choose not to wear a helmet.

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