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.
Tuesday June 30th, 2015. The NBA free agency period began at 12:01 a.m. ET on July 1 and teams immediately began formally jockeying for position to sign some of the league's top talent.â. While players and teams can now officially agree to contracts, players can't officially sign contracts until July 9.