“These are Stone Age things. They had heat and light. They had fire. They rubbed flints together and made sparks. Could you rub flints together? Would you know a flint if you saw one? If a Stoner Ager asked you what a nucleotide is, could you tell him? How do we make carbon paper? What is glass? If you came awake tomorrow in the Middle Ages and there was an epidemic raging, what could you do to stop it, knowing what you know about the progress of medicines and diseases? Here it is practically the twenty-first century and you’ve read hundreds of books and magazines and seen a hundred TV shows
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