I apologize for the pictures but I read two sentences . . The doctors did not roll from their heads On the breasts of women to hear the heartbeat However, in 1916 there was a French doctor Renee Lebar was suffering from embarrassment From using this method to the point of thinking about the retirement of medicine .. One day he was leaning on a tree trunk When Bo heard the sound of a bird clicking at the top of the tree He realized that the trunk carried the sound vibrations to him though In the distance, he had the idea of a medical headset All times are GMT. If his inventions were the text of our youth doctors ☺ I doubt it was the same tree under which Newton was sitting The tree only responds to the 😂😂✌ .