super sniffer skill that women have that men don't there's an area of your genetic code known as the major hysto compatibility complex and that underpins the diversity of your immune response to disease rather bizarrely some of the genes in that complex also underpin your sense of smell what women can do is they can actually smell how close a male's set of MHC genes are to their own so if they're close to their own they will not like the smell of that person because it's suggestive of in breeding and actually what you want for your child
is the most diverse immune response you can have we think women can do it and men can't either because they've evolved to do it or they've retained it because for a woman making the mistake of in breeding is much more serious if she becomes pregnant going to be out of the game nine months doing in our evolutionary part something very dangerous which is be pregnant and give birth and so the risk to her of death is high and therefore kind of have to be pretty sure that this baby that you're going to birth is going
to be strong and is going to be healthy
