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That's very cool! me too! What things do you find most interesting? Electronic Audio/Video gear? Buildings and bridges? Airplanes and cars?
Engineering is the best field to study if you like to understand how things work. It requires a bunch of math though. An alternative if you don't dig math is engineering technology which focuses on the more practical aspects. You can also work in this area without a degree if you have the desire and motivation to be an "expert" on how things work...
I'd like to hear what types of "things" you like to know about then I can recommend some fields to consider studying or jobs to consider.
Hope this helps!