In 1999, woodworker Steve Gass invented a device that makes it nearly impossible to be seriously injured by a table saw. His invention would prevent some 32,000 serious injuries—including 4,000 finger amputations—per year, but power tool companies resisted the change. Steve Gass and our resident safety expert, Monona Rossol, talk about why it's taken so long to have this and other safety devices accepted into everyday use.