Nobody would be able to understand me because English has diverged so far from 12th century English that it’s a different language. Also I’d be in north America where nobody had even seen a white person. Additionally, I’m 20 ft above the ground right now in a building that didn’t exist back then. Finally, I’d be rightfully blamed for bringing plague to the native tribes of the area and likely killed.

Assuming those hurdles were all cleared: I’m a mechanical engineer. So, I’d tell the natives where iron ore, coal, and oil was buried and how to extract and refine it. Tell them how to make gunpowder. Speed run making steam engines and lathes. Get north american natives armed, industrialized, and organized against the external European threat.

Mark Rober is what you get when you cross veritasium with Mr beast. Someone who’s genuinely smart but they’re going to leave all that stuff out because they want the bigger audience