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.
Undrafted rookie free-agents are popular along with late-round draft picks. A player can be eligible if he does not have an accrued season in the NFL, although the NFL has now approved a maximum of two spots on the PS for players with no more than two accrued seasons. To have an accrued season, you have to be active for at least six regular-season games.