Here you find both a short and long version of an interview Ohad gave to explain the concept of Tau and Agoras:

Short: https://www.youtube.com/watch?v=ALtXfGazvLM

Long: https://www.youtube.com/watch?v=zFmaX-oumNw

You can also check out how Tau might look like in a couple of billions of years: https://www.ageofchains.com/gallery/#&gid=2&pid=2

Have fun!