House cleaning has been an innate human activity forever but only since the early 19th century have mechanical devices replaced the physical labor (performed mo

Discusses the history and technical development of the vacuum cleaner, from the first carpet sweepers of the nineteenth century to twentieth-century improvement

House cleaning has been an innate human activity forever but only since the early 19th century have mechanical devices replaced the physical labor (performed mo

New York Times Bestseller Do you believe in magic? Can you imagine a war between wizards? An exciting journey in an airship or down in a submarine? Would you li