Every kid learns at an early age, much to their surprise and befuddlement, that a girl’s pair of girls aren’t ever exactly the same. One is always larger than the other — it’s just usually by an amount so trivial that it can hardly be quantified. In extreme cases of cup-size disparity, you get the tipped scale. More socially savvy women who happen to be afflicted with this nuisance tend to pad a cup to balance things out, but some girls just go commando and wind up as examples in the blogosphere.