The 3.6 pounds of brain mass standing by at all times to help us THINK before we make a move. I have posted little signs on and near my machines, now that I'm a little older, and they simply say THINK!. Each time I make a cut, start a machine,begin a pass with the router I pause for just a second and think through what I am about to do. When using the table saw I have a little mental chant I use,which you may find silly, but it works for me. I simply think/say "teeth teeth teeth" meaning, don't reach for anything on the table until you can see TEETH of the saw blade.If I can SEE teeth, the blade isn't turning. Okay men.....thats it. Smoke 'em if you got 'em.