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The smartest among us are still infinitely ignorant. There's not a person in the world that knows from beginning to end how to make the simplest object. Take a pencil for instance. The materials have to be mined and harvested, and we use machinery to do so. Who knows how to dig up minerals from the earth, turn it into mining equipment, build engines, extract and distill fossil fuels, etc, etc.
Specialization has allowed us to accomplish what is impossible from general knowledge, and allows relatively unskilled people to contribute. I thought about this at my last job working at a silicon wafer plant. Nobody there knows how to do everything to make a silicon wafer, yet bags of polycrystalline silicon rocks go in one end of the building, and computer grade silicon wafers come out the other end.
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