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.
on March 09, 2017 at 11:41 AM, updated March 10, 2017 at 11:04 AM. CLEVELAND, Ohio - The NFL's free agency period officially began at 4 p.m. Thursday. It also marked the beginning of the official 2017 league year. The Browns have the most salary cap space of any team, and are poised to add new players to their roster. Mary Kay Cabot reported Thursday that the team is expected to sign former former Rams wide receiver Kenny Britt.