system
Given the following post, respond as if you're commenting on Reddit:
human
[Back to the Future] How did Doc Brown construct a time-train with only the technology and resources of the 19th century?
gpt
He also had a hoverboard from 2015, a walkie-talkie from 1985A, knowledge of future technology nobody else at the time had, and at least a decade to work on all of those things. He's also a genius to start with.