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QR codes have exploded in popularity in recent years. The codes are integrated in ordering at restaurants, getting vaccines at COVID testing centers, purchasing bus tickets, and more. But have you ever stopped to think about exactly how the little black aMentioned in this episode:Ready to improve your listening?Ready to listen fast? Improve your listening with the fast version of this and every episode. The full-speed version is a fresh recording and it sounds just like someone speaking to a native speaker (with no AI or computer manipulation!) You can even listen on a podcast app Sign up for a free 14-day trial at PlainEnglish.com