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Take a camera: People have been making glass for a long time, and you can just find glass anywhere there's sand and lightning or heat. A box. Yep, that's not hard. Pinhole cameras were known for a long time. Paper? Wood? Film, now *that's* the tricky part, but, just a camera?
Nah, I've heard that same kind of Ayn Rand fantasy that only a wealthy society invents things. If that were true then nothing would be invented since everyone was poor in the past. The confusion is confounding invention with mass production.
