Can a person really make salt and cannons if he travels to the future? A person's ability is limited. I have imagined countless times that if I traveled back to ancient times, except for some modern theoretical knowledge in my mind, I would know nothing else. How can modern technology be applied to ancient times? Productivity can't keep up. I think most people use ancient tools. One person can't make salt and cannon according to the current method, right? As for poems and songs, there were frequent wars in ancient times, so most of them were useless. If they traveled through time to a landlord's house, they would be of some use, but if they were in the market, they would be of no use at all. I feel that if you travel to ancient times, you just know a few more words, and the rest are of no use to ordinary people, and it is extremely difficult to survive.
