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 expected, new rules impact free-agent market. Fewer players subject to compensation, but teams must weigh loss of own Draft picks. If it seems you heard more than ever about Draft-pick compensation for free agents this winter, well, it might be because you did. New rules governing Major League Baseball free agency and the First-Year Player Draft resulted in a new set of dynamics as clubs weighed the costs of signing players. Kyle Lohse, one of the top free agents on the market this winter, remains unsigned with Spring Training under way. Michael Bourn, one of the top hitters, agreed to a deal on Monday. It's not all that unusual for some big-name players to be unsigned after the new year begins, but mid-February is another matter.