Explains simply, with excellent diagrams or pictures, how many common appliances, machines, and technologies work. Also covers health, animals, and the home. A small sample of topics covered includes: smoke detectors, remote controls, UPC bar codes, bread, digital clocks or watches, compasses, microwave ovens, fuel cells, hybrid cars, Boolean logic, lock picking, and more. Many have links to Web sites or related articles for further reading. Some of these articles might be useful for background for science projects.