Fireworks, explosions, ignition of a fuel-air mixture.
it's quite amazing that it's just one of those stunningly simple things, like burning a candle-- that one of these engines require to move you. i mean, imagine what would happen if you poured a whole tank of petrol on the ground and burned it. You'd get an explosion of proportions.. LOTSA enerGY! HOT!..
but some smart people figured out how to use that to drive you to school everyday, to get you to the movies with your friends without having to take HOURS to WALK there. to build it in such a way that saves your money by using LESS petrol!
i take my hat off to them.. and so should you..
Here's to the engineers who work so hard to make the world a better place