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How Cool Stuff Works

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How Cool Stuff Works, 9781405308373 (1405308370), DK Adult, 2005

Communication systems have existed for thousands of years. A postal system, with relays of riders to deliver messages, was used in Ancient Persia (now Iran) as long ago as the 6th century BC. Until the 1800s, sending post in this way was the only method of long-distance communication. The time it took for a message to be received depended on the speed of the carrier.

Ever wondered why your trainers are so comfy or how your mobile works? You use many kinds of incredible technology every day but do you have any idea how they really work? Flip to the facts in this incredible book with amazing illustrations and eye-popping explanations. Dazzle your friends with your knowledge of gadgets and gizmos. A cool book for cool kids!

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