Our voices betray information about us without our being able to control it, or at least not easily. We're radiating all this information about where we've been and where we grew up. Our vowels assume their flavor and shape from what we hear from our parents. It's ironic that our voices both connect us and they also divide us. I think of it almost like you nevvere walking around with these telphones that are sharing all these intimate details of our lives. You cannot speak without differentiated vowels. And a bunch is baked into those, those vowels, and also how we do our consonants.