Which design innovation, introduced in the 1960s, revolutionized the stethoscope by dramatically improving its acoustic performance?

The stethoscope is one of medicine's most iconic tools, but its design has evolved significantly since its invention. This trivia question explores a pivotal design innovation that transformed this essential medical device from its original form into the modern tool physicians use today. Test your knowledge of medical product design history!

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• The tunable diaphragm that could detect both high and low frequency sounds
• The binaural design with two earpieces
• The introduction of the 'Littmann' chest piece with floating diaphragm
• The replacement of wooden tubes with flexible rubber tubing

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