Concussions have always been a concern for those who play contact sports. However, there’s been a renewed focus in recent years by the sports community -- the NFL in particular -- to learn more about concussions in the interests of promoting player safety. Pro leagues aren’t the only folks tackling the problem, though. Verizon, Intel and Ridell are all building systems to help identify concussed players. Reebok and mc10 have collaborated to create CheckLight, a head impact indicator meant to make it easy to see when an athlete has taken a dangerous blow to the head. The CheckLight is composed of two parts: a sensor device built by mc10 and skull-cap made by Reebok.