![John McWhorter](https://i0.wp.com/americanstudies.columbia.edu/sites/default/files/styles/cu_crop/public/2017-02/John%20McWhorter_2.jpg?w=660&ssl=1)
Lecture 9: Language Families—Tracing Indo-European
Linguists have reconstructed the proto-language of the Indo-Europeans by comparing the modern languages. Applying this process, we learn the Proto-Indo-European word for sister-in-law that was spoken 6,000 years ago.