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"Home vacuum cleaners have been in use since the mid 1800s, when they were powered by hand-operated bellows.  Modern vacuums are efficient dust and dirt cleaners. Knowing how vacuums work can help you keep a cleaner home and make a good decision when purchasing a new vacuum. Take this quiz to see how sweeping your vacuum knowledge is."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/vacuum-cleaner-quiz14.htm>