Great article Karen and highly informative about ski safety and MEMS. I agree that more of this type of technology should be used to protect our kids and their safety (and those of us that ski responsibly).
We don't want to live in a bubble, so enjoying things like skiing, bike riding, makes for a richer life and the fact that MEMS technology could create a safer environment is pretty exciting!
Skiing is inherently dangerous. And most injuries are from falls or collisions with fixed objects, not from colliding with other skiers. The only good way to prevent ski injuries is not to ski.
Assessing concussions is difficult: even if you know the deceleration of the skull, you don't know how hard the brain hits. And is it really that useful? The main treatment is rest, which you are probably going to do if you are a skier and hit your head hard, whether or not it was a concussion.