Mad Machines And Dotty Devices


From using a balloon to create a rocket, to powering bottles through the water with paddles, these tried and tested ideas will soon have you on your way to techno-wizardry. You’ll also learn to spy on neighbors with a secret Spyscope, or look at your friends upside down with a pin-hole

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SKU: 9781902915913 Category:


Mad Machines And Dotty Devices: Mind-Boggling Inventions!