darkdemize

This answer right here. Additionally, things that use the frequency for timing such as clocks may operate faster or slower than intended depending on which way they are being converted.

I’ve heard a theory that China’s relative isolationism during the western world’s era of exploration and colonization was due, at least in part, to their historical practice of female foot-binding. Because of the practice, a large portion of the female population was highly immobile, and the men were were reluctant to leave them behind. I doubt it would fully explain the isolation, but it certainly could have had some influence.