Ernie Wisner wrote:yes it has been hoed and planted and harvested. but like most things that can kill you. it needs careful stewards. For instance have you ever worked with live steam? have you ever done plumbing (not the connect pipe A to pipe b in this book but actual work on systems that are pressurized and if you get it wrong you get to try and shut it down while its spewing fluid at pressures that saw through 2X4's?) That sort of thing. Do you under stand the concept of dont put a valve in a system unless it is absolutely necessary cause some on WILL come shut it off Etc.