Article: The man who listened to the heart.

When you go to your doctor, he or she uses a stethoscope (STET-Huh-skope) to listen to the messages sent by your body. Your doctor can hear the ticktock of your heartbeat or check your lungs for possible congestion.

There was a time when a doctor could only listen to these important sounds by putting his ear to a patient's back or chest. This did not work very well because there was nothing to amplify the sound.

The idea for the stethoscope came to a young French physician, Rene Laennec, when he had stopped to watch two children at play. The children held a wooden stick. One child scratched his end of the stick, while the other child held the opposite ...

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