There are a lot of really challenging questions about how to count languages, so I'd need to read the actual study to determine how they counted. But this is a

There are a lot of really challenging questions about how to count languages, so I'd need to read the actual study to determine how they counted. But this is a pretty cool result actually. I'm also interested in how they quantified 'ease of articulation' for bilabials vs labiodentals. Also, for those who don't have an overbite, can you more easily make er... reverse labiodentals (dentalabials?) where you use your lower teeth and your upper lip? I have an overbite, but the sound seems largely indistinct from my 'v/f'. I guess I'd have to see it's effect on surrounding vowels a bit more too. But different articulation points for the same sound are not unheard of (there are two different ways of making 's' for example). Quite cool.