Earlier quoted context omitted.
I'm reminded of when my son, who was six at the time, came into the house and announced that he and the neighbor's boy, nine, were building a bomb, and that he needed to get some stuff from the pantry. When I investigated what exactly was going on, they were putting "hot" things like black pepper and Tabasco into a plastic bowl and were going to "set it off" with a match. Thankfully, that complete failure seems to ha…
Age eleven and had access to a chemistry set that a relative gifted. It had sulfur, but the saltpeter, and charcoal came from elsewhere. The 1960s encyclopedia had the instructions. Let the kids play.
I tried this as a grownup because I finally managed to get my hands on saltpeter (could only dream of it when kid). Followed the instructions, mixed everything in correct ratios, lit it with great care and fanfare and... hiss fizzle. I was so disappointed! I think it came down to purity of ingredients and not enough surface area.
Point is, there are certain details of the process required to make it truly work, that are not readily known; in a similar way with nuclear energy, the theory is pretty well known but some nitty gritty details like the implosion or detonator design are not.