A television game show in Nigeria’s commercial hub of Lagos has an unforgiving rule: Speak English and you lose. For a U.S.-born millennial in the audience and a student of her parents' mother tongue, the high-stakes setting is a perfect classroom.
Meanwhile, a 15-year-old Canadian speaks to a teacher about 13,000 kilometers (8,000 miles) away in Zimbabwe, learning a language her parents feared she would never speak.
