Earlier this month, PNAS (Proceedings of the National Academy of Sciences of the United States of America) published an article on aDNA in Scotland (doi.org/10.1073/pnas.1904761116). It was interesting to the extent that it discussed the impact of Norse Vikings. Because there are so many (a)DNA publications nowadays, I usually wait until something more revealing comes along to post about. However, today, I read this thread on Twitter that I think is rather enlightening. Do read the whole thread after you’ve read the PNAS article.