"Explains the principles of inventing and provides photo-illustrated instructions for making a variety of structures and contraptions"--Provided by publisher.
"Explains the principles of inventing and provides photo-illustrated instructions for making a variety of projects that harness energy"--Provided by publisher.
"Explains the principles of inventing and provides photo-illustrated instructions for making a variety of projects that recycle and reuse materials"--Provided by publisher.
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