It’s actually curious how does one arrive at the idea of using plants like that in the first place, when they are an early human or an orangutan. Probably at first, they just applied random plant matter to cover up the wound, or chewed plant matter to cool it down (it will keep moisture for longer than water). And then noticed that some plants are actually more effective at that.

To me, it’s more surprising that we actually know quite a lot about the brain - and yet we still manage to discover new things about it, even fundamentally new like new cell types. Wow.

I think Gogol (a classical Russian writer) called a 35 year old lady “an elderly woman”. Never paid that close attention, but I imagine such occurrences can be found throughout classical literature.

It has to do with environmental factors, I think. Like maybe their station affects acoustics somehow. Overall, a dialectal linguistic change generally requires a shift of generations.