Mr Shaha's Marvellous MachinesTransform household objects into your very own home made toys and machines! Over 15 fun engineering projects from scientist and dad, Alom Shaha. Learn about the centre of gravity by making a balancing bird, create a toroidal vortex with a smoke ring machine, and turn a spoon into an electromagnet. Chances are you won't need to buy the materials required for these machines because they're all in your house right now. Every child can be an engineer with