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1 " Invention is the most important product of man's creative brain. The ultimate purpose is the complete mastery of mind over the material world, the harnessing of human nature to human needs. "
― Nikola Tesla , My Inventions
2 " The progressive development of man is vitally dependent on invention. It is the most important product of his creative brain. "
3 " Indeed, the most important product of knowledge is ignorance. "
