No offense, but that the world spoke one language at one time is recorded in the best selling and most authoritative historical record known to mankind.
aka the Bible, in Genesis.
At Babylon, all men spoke the same language, and had all joined with the devil to break a portal open into heaven.
God confused their languages and they all scattered, each language group sticking together.
This sort of "discovery" of something written down 3,500 years ago is hubris at 11.