Here’s a problem which hasn’t been given enough thought, in my opinion. Before the invention of scissors, how did people cut their hair? No, seriously.
I seem to remember a suggestion from some evolutionary psychologist that we evolved hair which required cutting so the socially capable could distinguish themselves from social outcasts, who, unable to find anyone to groom their matted locks, would wander round looking like Ozzy Osbourne. But that presupposes some hair-cutting technology. I’ve never tried cutting hair with a sharpened flint stone, but imagine it wouldn’t be easy. In fact it’d be hopeless. Singeing it off? A bit risky. I’ve really no idea.
And then there’s toe nails….
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