Helmet designers have so far failed to account for a key cause of brain injury—the kinetic energy that travels through the head after an impact and makes the brain slosh inside the skull. That’s according to Ellen Arruda, a mechanical engineering professor at the University of Michigan, who is leading an effort to change that. She and her colleagues have unveiled a prototype of a new helmet technology capable of dissipating a significant portion of that kinetic energy, also known as the impulse, before it reaches the brain.
