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.
As John Schuhmann explains for NBA.com,  With the four free agents and 46 guys under contract, there will be a total of 50 current NBA players, representing 22 different teams and 18 different countries, at the World Cup, unless there's an unexpected roster change in the next four days..