so i'm reading Code: The Hidden Language of Computer Hardware and Software by Charles Petzold, which is an amazing book. he starts off with a simple explanation of the telegraph relay, and from there builds in tiny steps: simple circuits to logic gates to integrated circuits to memory storage to opcodes to assembly language and on and on, and in the end he's done a fairly fantastic job of conveying just what it is computers actually do when they do stuff. like, i can describe a circuit that stores data and i know how you'd string a bunch of logic gates together to get there. anyway, it's inspired me to go out and build a few logic gates of my own, maybe put together a small binary adding machine, just to see if i can do it. here's the problem: while i understand this stuff in principal, i have exactly zero idea of how to start physically connecting relays and lightbulbs and whatnot. does anyone know of some sort of electrical engineering hobby kit? i know my dad had one when he was a kid, but i've never seen anything like that myself. (maybe there's some software simulator these days?) essentially, that's what i want: electrical engineering for kids. as in, here's everything you need to get started in one box, with plenty of simply-worded instructions and little chance of self-electrocution. any hobbyists or engineers out there who could point me in the right direction?