spark plugs are cool .....I broke one apart one time to see what was inside but it didn't go very well ......then I realized I could have just googled it for a pic like this to see how it works.
its stuff like spark plugs that amaze me to think of who thought of it. I mean who actually had the thought evolution to come up with a design that works and has become universally accepted. And who would have thought ceramic.
I wish I could invent something like that.
