It was already known to be a very recently-developed mutation, so that's not that surprising. It might pin it down a bit more, and it is interesting that it in

It was already known to be a very recently-developed mutation, so that's not that surprising. It might pin it down a bit more, and it is interesting that it indicates that it spread so quickly in the first couple of thousand years. Because so many people are still not lactase persistent, it is still possible to see how much that changes over time and the change might be noticeable over a relatively few generations.