Focus, focus, focus. A couple of years ago I was resawing some walnut on the band saw. I had three boards to cut and, after the first two, I noticed sawdust had built up at the bottom of the fence and I was afraid that the next board wouldn't be flush. So, without thinking (the root of most accidents) I brushed the saw dust away with my hand without turning off the saw. Fortunately, I didn't quite hit the bone but it was close. A few stiches into the front of my left hand ring finger, and a couple of weeks out of the shop taught me a lesson that I thought I already knew. On the up side, every time i walk into the shop the first machine I see is the band saw and it brings back the memory. To me it's a constant reminder to pay attention not only to the specific task (like wiping away sawdust0 but to my complete environment. Like the situational awareness I learned in the army but applied to the shop.