No, our bones are not dry and actually contain living cells!
They also have blood vessels running through them like the rest of our bodies.
I don’t know why but I have this strange voice telling me the expression originates from travellers seeing the carcasses of dead animals in deserts. The bones would then be very dry, and probably free of meat after being picked over by vultures.
That could be something I’ve just made up in my own head now though…
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