Imagine you travelled back in time to the stone age with nearly all of modern science and technology memorized. Let's also stipulate that you can communicate perfectly with the people living back then, and they won't kill you on sight. How quickly could you push human civilization forward to reach the same level of material progress as the world you came from?
This is a companion discussion topic for the original entry at https://www.fortressofdoors.com/what-is-the-maximum-rate-of-human-progress/