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.
Now that the NFL offseason is here, the first order of business -- aside from the NFL Combine in late February -- is determining which impending free agents teams will want to keep. One of the most important decisions to make is whether to assign the franchise tag to a marquee player. The franchise tag is more or less a last resort for teams trying to retain their best unrestricted free agents. It's essentially a one-year deal that grants a window to negotiate a long-term contract. If no deal is struck before July 15, the player gets locked into his one-year deal.