If someone with power would listen to you, I think the biggest advancements the average person could take back 500+ years would be related to hygiene and medici

If someone with power would listen to you, I think the biggest advancements the average person could take back 500+ years would be related to hygiene and medicine. The mere introduction of hand washing in situations where people are intimately caring for one another has saved millions of lives. I also think the average person now has an amazing amount of knowledge about the body and its operation compared to even a qualified doctor of 200+ years ago.