"To make myself as plain as I can, I should give my standards for technological innovation in my own work. They are as follows:
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1. The new tool should be cheaper than the one it replaces.
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2. It should be at least as small in scale as the one it replaces.
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3. It should do work that is clearly and demonstrably better than the one it replaces.
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4. It should use less energy than the one it replaces.
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5. If possible, it should use some form of solar energy, such as that of the body.
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6. It should be repairable by a person of ordinary intelligence, provided that he or she has the necessary tools.
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7. It should be purchasable and repairable as near to home as possible.
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8. It should come from a small, privately owned shop or store that will take it back for maintenance and repair.
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9. It should not replace or disrupt anything good that already exists, and this includes family and community relationships."
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