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 have been the end of either of their mad scientist careers, as they are now twenty and twenty-three, and both well-adjusted, peaceful members of the community.
When I was 5 or so, I was convinced that if I dropped a bowl of hot water into a bucket of cold water, I'd get big explosion. That experiment yielding lukewarm water ended my mad scientist career.
When I was 24 and a PhD student, I wondered one day if I can eat condensed milk hanging head down.
Never let your age stop your curiosity.
But also learn from other's mistakes (and don't try to eat condensed milk when hanging head down)
When I was 7 or 8 a friend and I crimped the heads off strike-anywhere match sticks, wrapped them in foil, and struck them with hammers and rocks. They were quite loud, one even set off a sound-activated toy inside the house.
I make no claims as to how well adjusted I am, but I've at least survived 40-odd years of life since then.