Tweedehands. Papieren omslag wat beschadigd. Binnenwerk uitstekend.
Haven’t you ever wondered how a plane stays up in the air, how fish fingers are made, or why blood is red? These are just some of the fascinating questions this series answers in a fun but detailed way. Each book comes complete with a free, fully interactive CD-ROM including exciting Internet links that will take children to the most interesting and informative sites on the net. Knowledge Master Plus will tell children everything they want to know about some truly amazing subjects. HOW THINGS WORK explains how familiar gadgets, machines and work. Find out what makes a clock tick, or a light bulb work, or even how an aeroplane flies.