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.
Take a look at where the top free agents of 2015 have signed, and which free agents are still available. Many of the top 101 free agents, according to NFL.com's rankings, have signed on with new teams in the first week of free agency. The San Francisco 49ers picked up a highly coveted addition in the early stages of the offseason player movement period. The club signed wide receiver. to a five-year contract.