again, a dutch linguist, another friend of mine, renie, i, breck's who's at the university of you tracked. looked into this in some detail. and there's 2 interesting for facts about the quote sun. one of them is that they emerged very early in sub-saharan africa almost about 140000 years ago as a kind of genetically isolated group. and when you can show they're genetically isolated, we can do this from the genome studies now. so that's one thing. and the 2nd thing is that this click sound, in fact, does require a certain structure to get to the roof of your mouth. that makes it easier to make those sounds and others and that click language and you can show aside from some, you know, there's some few cases where the people borrowed the plates. some adjacent groups and others. so, but really was able to show that there's a release or like noise that you can ignore. those complaining ridges are just associated with the quayside. so his hypothesis is, in that case, there is enough time for this kind of effect to build up on the roof here, match to may, to make it adapted to this, making a cli