When (or if) kids learn phonics at school, they’re taught the symbols that go with sounds of their country’s native language or languages. People all around the world grow up learning to make specific sounds with their mouths by imitating the language(s) they are immersed in, which can leave us completely unaware of how many other sounds there are until we hear a language that’s far different from our own.

Even the common foreign languages that American school kids learn have sounds that can be tricky to get down. The rolled “r” in Spanish. The nuances of French vowel pronunciations. The glottal stops in German. The sound that’s a mix between “r” and “l” in Japanese. And for people learning English, one of the trickiest sounds to get down is “er,” as in the American pronunciation of “bird,” “world,” “summer,” or “percent.”

A sound that’s rarer than you’d think

Oddly enough, for as common as the “er” sound is in English, it’s........

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