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.
NFL Free Agents age listing as of Sept. 1, 2015. To see a log of all NFL Free Agents Signings, click the link. Our NFL Free Agents Tracker will be updated accordingly for all of the moves. NFL Free Agents: Top 75 Take a look at the top 75 NFL free agents for the 2015 offseason. Unrestricted players only; kickers, fullbacks and punters are excluded.