Fire was a mystical, yet practical tool. We spent many hours learning how to create it, how to kill it. We tamed the beast and made it work for us. Fire provided us with food, with light, and with a place to gather around at night and sing campfire songs and tell stories.
Being good scouts, and budding scientists, we would experiment with the boundaries of this tool. What burned longest, what burned fastest, and what was the best way to build a fire. This led to some amusing consequences. In general, if you asked one of use to build a fire for cooking on, you would get something that burned so hot for the first hour, it could not be approached closer than a meter without protective clothing.
We experimented with chimneys. We found that if you took all your old sisal rope, coiled it inside a 44 gallon drum with no top or bottom, set the drum up on bricks so it had a good draw, and set fire to the rope, you could get 25 feet high flames.
Our curiosity extended also to the best methods for starting fires. We had matches dipped in wax, we had flint and tinder, we had liquid firelighter (colloquially known as "BP Spirits"), we even had the old favourite, the firebow.
And then we had chemistry. Boy did we have chemistry. Many many household chemicals can combust beautifully when mixed in the right way. Homemade incendiaries were fun and instructive. We cooked up batches of smoke bombs using sugar and saltpeter. We made black powder, we even corned it. We mixed brake fluid and HTH, although the resultant chlorine fumes lowered this solution's usefulness. Touch powder (Nitrogen Tri-iodide) was a staple, although not useful for actually making fires, just hilarious practical jokes. And making large iodine stains on the carpet. My parents still complain about that.
The holy grail of our fire making, however, was something you could carry around in your survival kit, had multiple uses, and could reliably start a fire. Bonus points if it was obscure. Strike anywhere matches were dangerous, and lighters are right out. Our solution was Potassium Permanganate (KMnO4). It was light, safe, you could use it to sterilize your drinking water or treat a blister, and when mixed with Glycerine, it bursts into a joyous flame. Both were easily accessible in any pharmacy, and are completely safe chemicals when kept separated.
It was useful too because it had a built in timer. You could drop the Glycerin onto the pile of crystals, and then you had a few seconds to find safe harbour before the show started. We used it to light firecrackers, and the aforementioned barrel of rope. With the addition of magnesium shavings, it became a good way to light home made thermite. It could be combined with other chemicals to make different coloured flames.
We didn't just dabble with the elements, we pulled up chairs to the periodic table and feasted on it's contents. By "feasted", I mean "set fire to". I learned more about chemistry, at least in the limited field of exothermic reactions, in scouts than I did in school, and still today I fondly recall most of those experiments.