With the revolution of writing came the ability for future generations to understand the world on a larger scale, and it is due to the lack of it that we only know about 5% of the human story (or 0.1% of the hominid story).
But there is another accessory of mankind that has given us a glimpse into the dark age of human illiteracy: the idol.
In "The Tin Badge", both Hoss and Adam teased Joe in a way that conveyed that they thought Joe was just a little kid trying to take on a man's responsibility.
Both Adam and Hoss were protective of him and always looked at him as their baby brother.
What makes this very remarkable is that thats nearly all that is known to have been carved throughout Europe and Asia for about 15,000 years.