Japan is an ethnically homogenous nation where everyone speaks Japanese, right? Not exactly. Other groups including the Ainu also have called Japan home, perhaps for longer than the Japanese themselves. Today, the Ainu language is spoken by only a handful of people. One of them, Russian-born linguist Anna Bugaeva, takes Patrick Cox to meet Ainu speakers (and non-speakers) on the island of Hokkaido. Along the way, we learn about the mysteries of Ainu, a "language isolate" unrelated to any other language in the world. Bugaeva says Japanese children aren't taught about Ainu culture because it contradicts standard Japanese history.