Linguists have recently reconstructed what a 6,000 year-old-language called Proto-Indo-European might have sounded like. This language was the forerunner of many European and Asian languages, and now you can listen to what it may have sounded like.

How do we know what ancient Egyptian sounded like, or Old English? Linguistics gives us the tools to reconstruct lost languages from the words we speak today. Here's how it's done.