The rise of QR codes | Learn the English expression ‘the naked eye’

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:Be an active learner with Plain EnglishAfter you listen to each episode, do the interactive quizzes and activities at PlainEnglish.com. You'll improve your listening, pronunciation, grammar, and vocabulary. Sign up for a free 14-day trial at PlainEnglish.com

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