Infographie: Bright Lights, Big Cities

Archeology.com By the 19th century, linguists knew that all modern Indo-European languages descended from a single tongue. Called Proto-Indo-European, or PIE, it was spoken by a people who lived from roughly 4500 to 2500 B.C., and left no written texts. The question became, what did PIE sound like? In 1868, German linguist August Schleicher used reconstructed…