Lasers can cause damage in biological tissues, both to the eye and to the skin, due to several mechanisms. Thermal damage, or burn, occurs when tissues are heated to the point where denaturation of proteins occurs. Another mechanism is photochemical damage, where light triggers chemical reactions in tissue.
March 9: Teams are allowed to begin negotiating with other teamsâ players who are set to become unrestricted free agents at the end of the league year. This is the first time the NFL is providing a window to negotiate with other teamsâ free agents prior to the start of free agency.
With modern free agency comes the transience of NFL players that most now-generation fans and analysts have grown up with. More teams and more dollars create a labor landscape where more  better opportunities lie with other teams, the grass often seeming truly greener on the other side (double entendre intended).awson is the only active NFL-er that was a member of the expansion Cleveland Browns franchise that was reborn in 1999 with Tim Couch ill-advisedly at the helm following his No. 1 overall selection.