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.
1 The agents of unrestricted free agents and ONLY the agents of unrestricted free agents are allowed to negotiate with teams. 2  If you're the agent of a restricted free agent you must wait until March 11 at 4 p.m. 3  ET before entering negotiations. 4  No contract can be signed until the official start of free agency on March 11.