The ancient Romans built elaborate networks of pipes to deliver water where they wanted it to go. The networks were a marvel. But many of the pipes were made of lead, and the water carried the lead along with it. One school of thought regards this as part of the reason for the decline and fall of Rome: lead poisoning gradually took its toll, impairing the thought and judgment of many Romans, especially at the top. The theory is much disputed; perhaps it contains no truth. But as a metaphor it is irresistible. We have built networks for the delivery of information—the internet, and especially
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