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You've been waiting over half an hour for a seat. It's incredibly crowded because you came at a peak hour, and everyone seems to be taking their time. Just as you're starting to get frustrated, the buzzer in your hand lights up and vibrates, alerting you that a space has opened up. No, you're not at a restaurant during the dinner rush — you're at the library. Restaurant-style buzzers are just the newest addition to Lisle Library, introduced at the beginning of June.