Invention on Instagram: "In the steep highlands of Papua New Guinea, Huli communities sometimes project powerful calls across valleys to reach nearby gardens and hamlets. The landscape makes paths long and winding, so a strong voice can carry a greeting, a quick alert, or a request to meet without crossing the ridges first. These calls are not random shouting. Huli vocal technique can include rapid pitch shifts similar to yodeling, a style they recognize in music and regard as a communicative fo