The Book of Wonders: Gives Plain and Simple Answers to the Thousands of Everyday Questions
by Rudolph John Bodmer
Sometimes when you, with your ear alone, think something is absolutely quiet, you can pick up a sea shell and hear sounds in it. But the sea shell will magnify any sound that reaches it. It would be possible, of course, to take a sea shell to a place where it would be absolutely quiet and then there would be no sounds. There are such places, but very few of them. A room can be built which is absolutely sound proof.🏁