Which ball do you scratch more – the left one or the right one?

Quora thinks this is a joke question. Itches are physiology: whatever OP had in mind, I think this is a real question, and it likely has some correlation with the nervous system that’s legitimate to explore. (Which would make this a survey question.)

Why I’ve been A2A’d, when all I know about physiology is that it’s a Greek word, is less clear to me.

The right.

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