Benjamin Sjavik thinks this is interesting: Then, a mere 6,000 years ago, ancient Sumerian commodity traders grew tired of getting ripped off. Around 3200 BCE, one of them had the idea to track accounts by scratching wedges in wet clay tablets. Cuneiform was born. From Chapter 1. The Human Interface from Conversational Design by Erika Hall Publisher: A Book Apart Released: May 2018 Note This is up for debate, but it doesn't affect the argument on the whole Share this highlight http://learning.oreilly.com/a/conversational-design/18678996/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in.