When Was the Automobile Invented?
When Was the Automobile Invented? The first self propelled “automobile” was built in 1796 by a French army officer named Nicolas Joseph Cugnot. It was a...
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How Are Sewing Needles Made?
How Are Sewing Needles Made? A sewing needle is a long slender tool with a pointed tip that is used for stitching. A hand sewing needle has a hole on the non pointed...
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Why Are the Letters on a Typewriter Mixed Up?
Why Are the Letters on a Typewriter Mixed Up? Perhaps you’ve noticed that the letters on a standard typewriter keyboard are mixed up, rather than being arranged...
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How Does an X-ray See Inside You?
The X-ray picture a doctor uses to see inside your body is really a shadow picture of your bones and organs. X-rays are a kind of invisible ray. They are related to...
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How Are Felt-tip Markers Made and How Do They Work?
How Are Felt-tip Markers Made and How Do They Work? A felt-tip marker is a pen which has its own ink-source, and a tip made of porous, pressed fibers such as felt....
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