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Here's a challenging thought experiment: What is the most modern technology that you could go back in time the farthest and still make? Ex: I think I could go back about 500 years and make: A simple camera. An electric battery. An electric guitar (but not an amp). You?
Thinking about the camera, I think it'd be possible to go back even farther. I think you could go back to the time of the Greeks or Egyptians and possibly make it. I think you could definitely go back 2500 years and create it in China.
So then the followup to this thought experiment is: If an expert from our time could go back 500, 1000, 2500 years and create a piece of modern tech, then *what* prevented that culture/location from figuring it out? There really isn't much in a camera but, nobody made one.
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?
150BC is pretty far to go back and still make a battery: https://en.m.wikipedia.org/wiki/Baghdad_Battery …
That would a very cool experiment to conduct. Could you take that and turn it into a battery now? If so then see what it can pull off. Can it do the electroplating? How strong is it?
Most modern - farthest back. So, the camera I'd be able to *maybe* make is from like 1850-1900, and I think it could have been invented in 1500. So let's say you think an old school transistor tube computer from 1950 could be created in 1500. Then, why wasn't it?
Radio. Bicycle.
The bicycle is interesting. That's something very recent but you could go back very far and make one. Radio requires electricity though, and magnets for the speakers.
Some of the most difficult things would be ready access to quality materials in one location. Have you ever read the Toaster Project? He makes some mistakes, but spends most of his energy driving around the UK to various resources. I think I could bootstrap machining tools.
I saw that, and it's definitely the main issue not just "knowledge". But there's some tech that's more viable than a toaster. One reply mentions a bicycle, which just require metal, if that.
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