This is one of those that has been participating in the study. i headed the ball. it hurt. you got the hammer. you measure what? this is kind of a nice setup here. we ve got the hammer that measures how much force goes into the blow, then this measures what comes out. you get to see all the changes here, spectral, content. not many people have seen this, but the idea of this is what? the full 90 here is a good first step towards trying to take some of the energy out of the blow. kids playing soccer some day may be wearing some sort of protective device. go ahead and hit that. now, what is the difference that you just saw? did it take out 50%, 5%, a couple percent? typically these will take out somewhere between 5 to 10% between each hit is what we ve seen so far. it s a good first step towards developing something that will really protect players when they re taking large blows. ....