This week I learned the “5 and 0” principle of compressed air calculations.  Here’s how it works.  I tried to enlist the engineering department at a compressor manufacturing company to look at an idea I had, and they required a $50,000 deposit on their engineering fee.  Then I looked up the price of a new compressed air textbook.  It was $500.  Price of gas?  Approaching $5.00.  That is the “5 and 0” principle in action.  If you want to help stifle this wildfire before it’s too late to prevent the downflop of civilization, you may download a copy of my new book Compressed Air Power Secrets: Power Pneumatics for Inventors (3^rd edition) for a suggested donation of $50.  The zero is optional.