What Is Energy?
Energy is the power to act. There are several different forms of energy, and one kind can be changed into another kind. But although it can be changed from one form...
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What Is a Vacuum?
What Is a Vacuum? A vacuum, in theory, is a space entirely devoid of matter. But no method has been devised for producing one. In practice, therefore, a vacuum is an...
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What Is a Detergent?
What Is a Detergent? A detergent is a substance which has a power to cleanse. This description applies to soap, as well as to shampoos and washing powders. A detergent...
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Who First Used a Powered Dental Drill?
Who First Used a Powered Dental Drill? The first powered dentist’s drill was made by George Washington’s dentist, John Greenwood, who adapted his mother’s spinning...
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Why Is Democracy Considered Good?
Why Is Democracy Considered Good? Democracy is considered good because it recognizes the rights of the individual and strives to maintain and protect those rights, for...
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