Well that's interesting the Kipsigies are er traditional people who live in Kenya  and if  they have , in other words er men have to pay a certain amount to the erm you know, woman if they're gonna marry her and what they did was they study the  and related it to the, to the girl that was actually getting married and what they found of course was that it fits the predictions of our theory er just as you'd expect, given that the cultural things you have to allow for like, like for example in that  most traditional cultures they like er women to be plump as we'll see in the, in the   actually fat is critical to female fertility and er so they might not have been plump, so what they did was they simply weighed the girls and they compared their, their, their weights with, with the, with the  and sure enough  strong correlation  the fatter the girl, the bigger the .