it's not just exploding wheels, and other 'you are more likely to be killed by a falling coconut' situations, if you are using a high speed grinder, the sparks can fly off and onto your clothing, setting alight to it/ burning you. One of my mates has taken a nail off on my flat grinder (whilst wearing gloves), his finger just slipped off the wood.Grinder's lung and other conditions that wont have an immediate effect, but eventually will can also come about from abuse.
I believe that if your tools are serious, so should you be.
I believe that if your tools are serious, so should you be.