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.
NBA free agents are players whose contracts have run out. They're no longer signed to a team. They're out of work, and need a new contract, either with the same team or a new one. NBA free agent negotiations began at 12:01am ET on July 1, 2016. Free agent signings began at 12:01am ET on July 7.