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I'm curious about 'touch screen style' and capacitor switches. ? Answered

Basically switches that do no not move, only needing a touch to activate. I've seen them as individual switches as opposed to a 'touch screen' like on a phone. Where to get? How they work? How to use in a circuit?

BTW: I love the class so far. I've read theory up the kazoo, but never had an opportunity to actually build something in a simple manner that I can understand and follow. Thanks!