I was thinking the same, I haven't heard 'huh' in Sweden, and 'va' doesn't sound much like it. I also read in the source: "Therefore we collected data from rec

I was thinking the same, I haven't heard 'huh' in Sweden, and 'va' doesn't sound much like it. I also read in the source: "Therefore we collected data from recordings of naturally occurring informal conversations in a sample of 10 languages from 5 continents, varying fundamentally in terms of phonology, word structure, and grammar (languages 1–10 in Figure 1)". That sounds pretty far from "all languages" as in the title.