Week 20: Wednesday, Plug In

A vacuum cleaner serves a very useful purpose. It has all sorts ofattachments. Many of them have an extension wand, a crevice tool, adusting brush, and an upholstery tool. Some are even more advanced andhave a ceiling fan tool and a pet grooming tool. There’s a tool for any job.And, of course, there’s the standard use—just pushing the contraptionacross the carpet to pick up dirt. Yes, a vacuum cleaner is a highly usefulpiece of technology and one that just about everyone utilizes. Virtuallyeveryone has a vacuum cleaner. But here’s the important thing to knowabout vacuum cleaners