Definitely interesting -- I haven't read the paper so I can't comment too much, but I remember from my phonetics class in college that (IIRC) there isn't a lang

Definitely interesting -- I haven't read the paper so I can't comment too much, but I remember from my phonetics class in college that (IIRC) there isn't a language that pronounces labiodentals with the bottom teeth against the top lip, even though it's totally possible. The trend of overbites could help explain this? Definitely nothing to read into wrt the deeper development of language, though -- having a greater variety of sounds doesn't actually correlate with any higher-level information density or anything (languages with smaller, easier to distinguish sound inventories that are less information-dense on a phonetic level are in turn pronounced faster -- see http://rosettaproject.org/blog/02012/mar/1/language-speed-vs-density/ http://rosettaproject.org/blog/02012/mar/1/language-speed-vs...)