As anyone who has tried to blag a vocab test will know, words really don’t have any logic to them. You can’t just “work out” what the German word for “fridge” is. That’s because, of course, words are arbitrary. Cat (or katze or chat) only means “cat” because at some stage people came to agree that it did. Words may share roots and flit across language barriers, but because there’s such a vast number of sounds a human can make, it’s very unlikely that we’d all spontaneously come up with the same word for the same thing.
Except that, apparently, we have. That word is “huh”. According to a recent study it seems to be pretty universal. The scientists (in what sounds like an excellent idea for a research trip), recorded bits of informal language from 5 continents, and of the 31 dialects they compiled, all had this same word in common.