OK, I don't want to reignite the helmet/no helmet debate - I'm sure your injury would have been worse w/o a helmet, but at zero MPH from a recumbent, shouldn't a standard issue helmet be good enough to prevent a concussion?

It seems to me that helmet safety technology is stagnant. When you go to buy a helmet, you are always told that all the helmets are equally safe because they all meet the same testing standards. The manufacturers do not want to claim more than this because they would then open themselves up to liability against said claims. So they also have no motivation to improve unless stricter standards are set. Thus, all helmets offer some amount of protection, but they could be doing better....