An occipital bun is a prominent bulge or projection of the occipital bone at the back of the skull. It is important in scientific descriptions of classic Neanderthal crania. This term has not been translated into most languages yet as it is rare amongst people today. Personally, I have it, and I know of quite a few rhesus negative people who also have it. This is why I am interested: Do you have an occipital bun? Do the rhesus negatives in your family have it? If you are up for it, find out your friends’ blood types and whether or not they have one. You might wind up being surprised by the results.