Update: A commenter noted that North England and Southwest Wales have different shape points. This is clear in the original PDF when I increased resolution. So ignore my comment about Brythonic Celtcs.
End Update
A few weeks ago I heard about the project to create a genetic map of Britain. Actually, I knew a bit about this because they’ve been publishing a few papers here and there over the years. But there is now an an exhibit up at The R
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