Tinkering

The term "No user servicable parts inside" means: Darn, I can't fix this thing. "I should have this repaired in about an hour, ma'am." Those danged bureaucrats in Washington! They don't let us fix things or repair things or let us do anything technical any more! Why don't they bud out?! Those danged lawyers at the company who built this thing! Do they really think I am going to sue them if I mishandle the high voltage/laser/CPU in this thing?! Those danged marketers at the company who built this thing! Do they really think I am going to sue them if I mishandle the high voltage/laser/CPU in this thing?! I am unfamiliar with the term. In what context does it appear? What interesting things can you do with potassium nitrate? Make a tiny bit of gunpowder as a demo for the kids. Maybe one of them will grow up to be a chemist and get a Nobel prize. (For enough gunpowder to make a cooler demo, don't make it: it is too dangerous. Go to a gun shop and buy a few ounces.) Melt it with sucrose and gently melt. Again, use very small quantities. Makes a good demo for solid rocket fuel. But it is too hygroscopic to make decent rocket fuel: there are better alternatives. Heat it in a test tube until oxygen evolves. Do the demo with a smoldering toothpick. Help stumps decay quickly. Put it in the garden or on the lawn. It is 14-0-44 fertilizer, and the plants will love it.