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.
March 16, 2017 3:19am EDT March 9, 2017 9:16am EST NFL free agency for 2017 has arrived. Here are this year's top free agents to officially be had come March 9. Le'Veon Bell (Getty Images) Spending a ton of money on players in NFL free agency isn't the best way to build a team.