Just in time for this year's BF, I come out with a nice talk about a certain breed of vacuum cleaners. I don't know if many of you know this, but vacuum cleaners have been with mankind since 1900s. These appliances revolutionized the cleaning process. The first vacuum cleaners used an air pump to create a partial vacuum, therefore, sucking up debris and dirt of the floors. The filth was gathered into bags before being disposed, and the rest of the air was liberated back into the working space, carrying with it small dust particles, allergens, and so on. With time, this part was roughly redesigned, and all sorts of filters were invented. A few … [Read more...]