Hi, I just read that Matsés, a native language in Perú, obliges the speakers to indicate the certainty of information provided in a sentence. It seems that Tuyuca and other indigenous south-american languages (mostly amazonic languages) do that to certain degree as well. I thought this would be a big topic in the EA forum, but when I searched for the term “Matsés” in the forum I only found this. Are such languages not an interesting phenomenon worth study to explore ways to do the same in other languages? I though the EA community would be fascinated by such languages and boiling with ideas on how to apply something similar in English and other languages.