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The interesting thing about phone numbers is that they're not much longer than IP (IPv4) addresses; I wonder what it would be like if DNS either hadn't been invented, or was introduced only after the Internet had grown significantly. Would everyone have used IP addresses just as easily as they do domain names today?

Then there's also physical addresses, which have been around even before phones, and from the point of view of computer science, they would be considered a horrible "ugly" mess, yet people also seem to have no problems dealing with them in their daily lives.

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