I had this hypoth­e­sis that [cer­tain sounds] might be more com­mon at high alti­tudes,” said study author Caleb Everett, an anthro­po­log­i­cal lin­guist at the Uni­ver­si­ty of Mia­mi. “I was not at all con­vinced that I would find the evi­dence for it, but when I actu­al­ly looked at the data, the dis­tri­b­u­tion was pret­ty over­whelm­ing.”