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Using machinery has become a commonplace for us, and we don't even think about why a huge container ship doesn't sink or how a space rocket overcomes the earth's gravity. We never think about the difference between a cannon and a howitzer, a tank and an armoured personnel carrier, a cruise ship and a passenger liner. If you are the kind of person who is interested in knowing this, we recommend reading our book. It has everything you need to spend your time with benefit: interesting texts, vivid illustrations, simple and clear diagrams.

The book is addressed to curious teenagers and their caring parents.