Why a stubbed toe hurts twice

Why does a stubbed toe hurt twice? A sharp zing runs on fast nerve fibers at up to about 30 meters a second, a duller ache on slow ones at about 1 meter a second. Stretch the body to 620 miles and the zing needs at least 9 hours to arrive and the ache almost 12 days. Idea and structure: Vsauce's Short "What If You Were 620 Miles Long?" Sources are in the pinned comment. #shorts #science #neuroscience