Klutz Lego Gadgets Science & Activity Kit $14.99 (regularly $25)

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Amazon has the Klutz Lego Gadgets Science & Activity Kit on sale for $14.99 (regularly $24.99).

Make, experiment, and play. This activity kit will have you building 11 machines including a gravity powered car and a wacky boxing robot. The fun doesn't stop once you've completed all of the projects in the book - open-ended prompts will inspire you to continue experimenting with your own designs and modifications.