While you may have some incandescent bulbs lying around, once they're gone, they will be gone forever. And you probably won't mourn their inefficiency; since about 90 percent of the energy produced in the bulbs is actually heat instead of light, they are huge energy wasters. While they generally last about 1,500 hours, this is still only a fraction of the lifespan of CFLs. These are lit by an electric current sent through a tube that contains argon and a small amount of mercury gases. These gases generate invisible ultraviolet light, which commingles with a fluorescent coating on the inside of the tube to produce light.
Explanation:
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The invention of the printing press allowed books and pamphlets to be made faster and more cheaply. This new technology helped spread the revolutionary ideas of the Renaissance and Reformation.
Explanation: The term scalawag was given by Southern Democrats to fellow white Southerners who had become Republican and supported Reconstruction after the Civil War. They were considered traitors by many Southerners who remained loyal to the Confederate cause.
