Mr Shaha's Marvellous Machines: Adventures in Making Round the Kitchen TableTransform household objects into your very own home made toys and machines! 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 the help of Mr Shaha and his marvellous machines. Written by a