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your voice on tape and which also operates as a loudspeaker; a one-way balloon valve; a metal detector; a box with a combination lock; a burglar alarm; an electric motor; a simple computer; musical instruments that play in tune; and a kite that flies. There are also working models that you can build to understand the principles that make things work. These include a model escalator with steps that move; a model autopilot that can sense its direction of movement; a bar-code reader that reads codes in the same way as a real one; a model aqualung that supplies air in the same way as a real aqualung used by divers to breathe underwater; a model rocket that takes off; and a model disk drive that stores information like the disk drive in a computer. These are only a few of the many experiments in this book. Some are simple enough for you to do on your own, while others are more complex and may require help. Carry them out carefully and you will find out about all kinds of things that you use or see every day-from cars to computers, from toasters to television, and from simple levers to mighty skyscrapers. 0 0
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