Kinetic energy is definitely the better design and test metric. But you still can't claim a linear relationship without large - yet controlled studies. And if i

Kinetic energy is definitely the better design and test metric. But you still can't claim a linear relationship without large - yet controlled studies. And if it is as good as they, a large/long trial could be unethical versus just widely deploying it and collecting the data you can. It is just as likely it is only twice as good at preventing concussions. The headline is almost click-bait.