How Does a Refrigerator Work?
How Does a Refrigerator Work? Earlier food was preserved by traditional methods like salting and pickling which were not always practical. Nowadays refrigerators are...
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Why Must a Fever Thermometer Be Shaken Each Time It Is Used?
Why Must a Fever Thermometer Be Shaken Each Time It Is Used? A fever thermometer is a special kind of thermometer. It shows whether or not you have a fever when you are...
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How Does a Chameleon Change Its Color?
How Does a Chameleon Change Its Color? Chameleons can change color because of special color cells called chromatophores in their skin that contain different colors of...
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What Makes the Wind Blow?
What Makes the Wind Blow? Wind is air in motion. Wind is caused mainly by the uneven heating of the air around the earth by the sun. Since the earth’s surface is made...
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What Is a Cold-blooded Animal?
What Is a Cold-blooded Animal? Many animals such as fish, frogs, snakes and lizards are often called “cold-blooded,” as opposed to “warm-blooded” mammals and birds....
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