While the whack of two helmets might be an unavoidable part of some high intensity sports, knowing a little more about what's going on during those impacts can mean the difference between a time out, and time in hospital. Reebok-CCM Hockey and electronics form MC10 have just announced that they are developing a wearable cap that will register the strength and severity of head impacts during games. The project is actually aimed at all sports and age-groups, and uses high-performance electronics reshaped into an ultra-thin, breathable, flexible system that technology partner, MC10, expects to also be much more affordable.