What Is an Extracorporeal Membrane Heart Assist Device?
What Is an Extracorporeal Membrane Heart Assist Device? An extracorporeal medical procedure is one which is performed outside the body. An extracorporeal membrane heart...
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Who Invented Cement?
Who Invented Cement? Concrete is a material used in building construction, consisting of a hard, chemically inert substance, known as an aggregate (usually made from...
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Why Did Men Wear Powdered Wigs in the 1700s?
Why Did Men Wear Powdered Wigs in the 1700s? Although wig wearing dates back to ancient times, the fad of wearing powdered wigs was popular during the 1600’s and...
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Why Does a Jet Plane Leave a Vapor Trail?
Why Does a Jet Plane Leave a Vapor Trail? The white streaks planes leave behind are actually artificial clouds called contrails, which is a shortened version of the...
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How Are Raisins Made?
Raisins are made from grapes that have been dried in the sun or by artificial heat. To make sun-dried raisins, sweet, seedless grapes are cut from the vines and spread...
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