“What is a radio? What is the principle of a radio? Go ahead, explain. You’re sitting in the middle of this circle of people. They use pebble tools. They eat grubs. Explain a radio.” “There’s no mystery. Powerful transmitters send signals. They travel through the air, to be picked up by receivers.” “They travel through the air. What, like birds? Why not tell them magic? They travel through the air in magic waves. What is a nucleotide ? You don’t know, do you? Yet these are the building blocks of life. What good is knowledge if it just floats in the air? It goes from computer to computer. It
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