Is There a Dog That Can’t Bark?
Is There a Dog That Can’t Bark? Yes, there is one breed of dog, the basenji (buh SEN jee), that you’ll never catch “barking up the wrong tree.” This...
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How Does a Smoke Detector Work?
How Does a Smoke Detector Work? There are two basic kinds of smoke detectors: ionization detectors and photoelectric detectors. A smoke alarm uses one or both methods,...
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How Does the Sound Come from a Record?
How Does the Sound Come from a Record? The vibrations of sound made by a person’s voice or a musical instrument are recorded in the wavy groove on a phonograph...
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Why Does a Boy’s Voice Break?
Why Does a Boy’s Voice Break? When a boy’s voice breaks, it is because his voice box, or larynx, is suddenly growing larger. The larynx, located in your throat,...
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What Causes an Echo?
What Causes an Echo? An echo occurs when sound bounces back from an object. When we speak or shout, sound waves travel through the air. We first hear the sound when the...
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