Rocketing up the charts at number eight, it's:
It's OK to have a third nipple
A supernumerary nipple (also known as a third nipple) is an additional nipple occurring in mammals including humans. Often mistaken for moles, supernumerary nipples are diagnosed at a rate of 2% in females, less in males. The nipples appear along the two vertical "milk lines" which start in the armpit on each side, run down through the typical nipples and end at the groin. They are classified into eight levels of completeness from a simple patch of hair to a milk-bearing breast in miniature.
The copy is pretty dull -- probably scraped from a previous post of mine, or from wherever I stole it from. Hey, it's all in the name of science.