Why Do Butterflies and Moths Have Powdery Wings?
Why Do Butterflies and Moths Have Powdery Wings? The “powder” on the wings of moths and butterflies is really a layer of tiny, colored scales which overlap...
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What Is a Robot?
What Is a Robot? A robot can be defined as a programmable, self-controlled device consisting of electronic, electrical, or mechanical units. In fact, it is a machine...
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How Does Tape Recorder Work?
How Does Tape Recorder Work? The tape for a tape recorder is coated with tiny bits of iron. When you speak into a tape recorder microphone, the sound pattern of your...
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Why Is Blood Red?
Why Is Blood Red? Blood gets its red color from a substance called “hemoglobin.” Hemoglobin has a molecule called a “heme” which has the metal...
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Is It Natural to Swing Your Arms When Walking?
Is It Natural to Swing Your Arms When Walking? For a long time, scientists thought that swinging your arms while walking served no purpose. Their best guess was that it...
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