How Old Is the Lens and What Is the Practical Use of It?
How Old Is the Lens and What Is the Practical Use of It? The oldest known lens was found in the ruins of ancient Nineveh, and was made of polished rock crystal, 4...
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Do Animals Cry?
Do Animals Cry? Most animals don’t cry the way people do. Many animals produce a liquid that looks like tears. These “tears” have nothing to do with...
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How Do Eyeglasses or Contact Lenses Correct Our Vision?
How Do Eyeglasses or Contact Lenses Correct Our Vision? If your eyes did not do their job, your eyesight would be fuzzy and blurred. People who have imperfect eyesight...
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Why Does the Moon Appear Orange Sometimes?
Why Does the Moon Appear Orange Sometimes? Moonlight, before it reaches our eyes, passes through the Earth’s atmosphere. As the light travels through the dusty...
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How Does an Inkjet Printer Transfer Ink to Paper?
How Does an Inkjet Printer Transfer Ink to Paper? Inkjet printers work by applying tiny droplets of ink to paper. This is usually done using one of two technologies....
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