We believe that there were settlements in this region as early as 2000, as early as 2000 BCE, and then we have the emergence of the first cities around 750 BCE. And even then, there are signs of significant cultural advancements. There's evidence that there was a sophisticated base 20 numeral system that included the use of place value as early as 1000 BCE. To put that in context, the Hindu-Arabic numeral system, which we now use, and most of the world now uses, it wasn't devised, we don't believe, until about a thousand years later. And it wasn't adopted in Europe until about 2000 years after the time where we see the first evidence of this Mayan numeral system, this base 20 system, that had place value. Now, around the third century BCE, so roughly in this time period right over here, we see the first writing. And these are examples of what a Mayan glyph looks like.