I mean we use base-10 and base-2 both all the time. I'm using base-2 to talk to you over the internet right now! > Seti and Aliens are the only one that comes

I mean we use base-10 and base-2 both all the time. I'm using base-2 to talk to you over the internet right now! > Seti and Aliens are the only one that comes to mind, encode a new numerical system based on some fundamental physical constant like the atomic weight of hydrogen. That's base-1, aka counting