The first plastic surgery.
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This was done by Dr. Harold Gillies when he discovered how to prevent the body from rejecting skin grafts by boosting the blood supply to the surrounding tissue by using a tube of flesh that he called a pedicle. The first patient to do this procedure was a naval gunner named Walter Yeo who was wounded in 1916.
Massive ear trumpets used to hear incoming planes.
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This was before radar was invented and so people used these to try and listen for incoming air raids. It was like a giant hearing aid which fed sound to the listener through two long trumpet devices.
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