Add Yahoo as a preferred source to see more of our stories on Google. The history of writing down thoughts and feelings could be tens of thousands of years older than previously believed, surprising archaeologists who made the discovery.

The ancient cave peoples weren't as illiterate as portrayed in popular media. Archaeologists have discovered Paleolithic glyphs in a German cave that could potentially push back the history of written communication by over 30,000 years, per a rock-solid study in the journal Proceedings Of The National Academy of Sciences.