The fact we understood about nature we were able to use to develop technologies that enabled us to survive and progress; and to be the most dominant animal species on earth. But technology is not science. Science only seeks to understand nature, no more no less; technology is but the application of wat science has discovered, for better for worst. That is why usefulness is not a prerequisite to the generation of knowledge; on the contrary, usefulness is the primary prerequisite to the generation of technology.
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From @yetunde