Who Invented the Battery?
Who Invented the Battery? A battery, which is actually an electric cell, is a device that produces electricity from a chemical reaction. Strictly speaking, a battery...
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How Was the Telescope Improved?
How Was the Telescope Improved? The improvement of the telescope to the powerful instrument of our time was a long gradual process involving many men and many...
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What Are Scales and How Do They Work?
What Are Scales and How Do They Work? Scales are valuable tools that help us keep track of our weight. In addition to doctors’ offices, you’ll also find...
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How Does a Washing Machine Get Clothes Clean?
How Does a Washing Machine Get Clothes Clean? A washing machine swishes clothes around in soapy water until the dirt has been removed. A washer has a tub and an...
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How Does a Zipper Work?
How Does a Zipper Work? A zipper, zip, fly or zip fastener, formerly known as a clasp locker, is a commonly used device for binding the edges of an opening of fabric or...
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