"God designed that the living machinery should be in daily activity. For in this activity or motion is its preserving power.... The more we exercise, the better will be the circulation of the blood."

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The word constructionism is a mnemonic for two aspects of the theory of science education underlying this project. From constructivist theories of psychology we take a view of learning as a reconstruction rather than as a transmission of knowledge. Then we extend the idea of manipulative materials to the idea that learning is most effective when part of an activity the learner experiences as constructing a meaningful product.

— Seymour Papert