"Mmm, I imagine that was quite the problem at the time, but it's been over a hundred generations, I expect natural selection has come into play, and some of the less desirable genes have been bred out over time. It would be fascinating to take some blood and do some genetic studies but I don't have that kind of equipment yet." Senku was giving the question serious thought though, it wasn't the first time.

"Overall, they are pretty healthy. There are people in the village who are in their 50s, even 60s, but I expect the average life expectancy is pretty low all the same. They didn't have much by way of medicine, so things like illness run rampant when they appear. It was lucky that Ruri's pneumonia didn't, actually. On average, in a year, they lose people to exposure and starvation. They were primarily a hunting and gathering tribe. I'd expect too, that probably infant mortality rates and childbirth are just as perilous."

"Some of them are nearsighted, that much I've noticed, but how they differ genetically I'm not in a position to say just yet."

Senku quirked a smile at that. "You don't say. Fascinating data point." It was good to know time wouldn't pass. "All the same, if for some reason I didn't return, I expect my generals will handle it, so I'm not worried."