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.
1 Under the new 2014 NFL rules, teams may sign no more than two players up to two accrued seasons. 2  A player is deemed to have served a season on the practice squad if he remains on the practice squad for at least six weeks. 3  Players are eligible to be on the practice squad for two seasons.