2 kids are playing.   They’ve a long piece of wood and a pin.   They take turns putting an end of the piece of wood to their ear while the other kid scratches the other end of the piece of wood with a pin.  The sound of the pin scratching one end is amplified at the other end – to the kids’ delight.   This scene is witnessed by a young doctor as he walks briskly on a cool morning through the courtyard of the Louvre Palace in Paris.   A couple of months later … Continue reading

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