>>>This would mean that lefties have some advantage when unscrewing, eh? Well, I beg to differ...
>
>/edit/ Fair enough, but Google "supination pronation strength" to confirm I didn't just make it up. ;-)

I don't have to - I feel that the strength of the palm's muscles is greater for inward than for outward motion. It's just that I don't feel any difference between using left and right hand in either case. It's equally unhandy for both :).