Proceedings of the National Academy of Sciences of the United States of America
A 2017 study published in the Proceedings of the National Academy of Sciences of the United States of America compared the trajectory of n-grams over time in both digitised books from the 2010 Science article with those found in a large corpus of regional newspapers from the United Kingdom over the course of 150 years. The study further went on to use more advanced Natural language processing techniques to discover macroscopic trends in history and culture, including gender bias, geographical focus, technology, and politics, along with accurate dates for specific events.