What if television sets were equipped with knobs that let viewers customize the shows they watch? If they could adjust the sex content, for example, or regulate the violence, or shift the political orientation to the left or right? What if motion pictures were able to monitor the attention level of audiences and modify their content accordingly, lengthening some scenes while cutting others short if they evoke yawns. What if the newspapers that reach subscribers' homes every morning could be edited with each particular reader in mind -- filled with stories selected because they affected his neighborhood, or had an impact...
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