How Does a Tape Recorder Work?
How Does a Tape Recorder Work? When recording on a tape recorder, a microphone changes the tone of your voice into electrical signals. As the tape rolls past the part...
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How Did the Butterfly Get Its Name?
How Did the Butterfly Get Its Name? No, one knows for certain why butterflies are called “butterflies.” There are several theories, however. Some people believe the...
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What Is a Super Ball Made of?
The Super Ball made its big bounce into the world in 1965. An extremely elastic ball known for its high coefficient of restitution. This curiously bouncy ball was...
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Why Do My Ears Fill up When I Land in an Airplane?
Why Do My Ears Fill up When I Land in an Airplane? The “fullness” in your ears when landing in an airplane is caused by unequal air pressure on the eardrum. The middle...
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How Did the Pretzel Get Its Shape?
How Did the Pretzel Get Its Shape? Most pretzels have a signature shape that resembles a knot. The pretzel’s unique shape is a symmetrical loop created by...
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What Is a Kiwi Bird?
What Is a Kiwi Bird? The kiwi is the best-known bird in New Zealand. Kiwi is related to a group of birds called ratites. The closest relatives to kiwi today are emus...
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How Did the Hamster Get Its Name?
How Did the Hamster Get Its Name? The hamster gets its name from the German word hamstern, which means “to hoard.” This is because the hamster does just that — it...
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Why Do Some Eggs Have Two Yolks?
Why Do Some Eggs Have Two Yolks? A common misconception is that a double-yolk comes from a “twin egg.” It may be possible for a fertilized double-yolk egg to produce...
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How Does a Thermometer Work?
How Does a Thermometer Work? Most thermometers are sealed glass tubes with liquid inside. A thermometer measures heat by the amount of liquid that expands when it...
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Why Are Polar Bears White?
Why Are Polar Bears White? The bear’s color helps it to find food. Polar bears live in a part of the world that is usually covered with snow and ice. Often they...
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