Cover of The Bike Lock That Ignored His Fingerprint

Quincy rides his bike to school every day. He locks it with a smart bike lock that reads his fingerprint. Most mornings, the lock opens right away.

On rainy days, something strange happens. Quincy presses his finger on the lock, but it does not open. He tries again and again, but nothing changes.

One rainy Tuesday, Quincy stands outside school, frustrated. His classmate Opal walks by and sees him struggling with the lock.

"Is your lock broken?" Opal asks. "I think so," Quincy says. "It never works when it rains."

"Let me see it," Opal says. She looks closely at the small sensor on the lock. "It's just wet," she says. "Try drying it with your sleeve."

Quincy wipes the sensor with his sleeve and dries it well. He presses his finger on the lock again. This time, it clicks open immediately.

"It worked!" Quincy says, surprised. "The lock isn't broken at all. It just needs a dry sensor."

"My umbrella lock does the same thing," Opal says. "Wet sensors are tricky."

From that day, Quincy keeps a small cloth in his bag. Every rainy morning, he wipes the sensor before he presses his finger.

🧠 Check your understanding

  1. When does Quincy's bike lock stop working?

    Show answer

    Answer: On rainy days

    On rainy days, the lock does not open when Quincy presses his finger on it.

  2. Who helps Quincy figure out the problem?

    Show answer

    Answer: His classmate Opal

    Opal looks closely at the sensor and tells Quincy it is just wet.

  3. What does Quincy start carrying after that day?

    Show answer

    Answer: A small cloth

    Quincy keeps a small cloth in his bag to dry the sensor on rainy mornings.

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