Why we can't tell what time it is when we're on our PC:
"Working behind the scenes, a small government agency headquartered outside of Denver operates a network of 14 servers capable of changing the operating systems on your PC--and millions of others--in less than a second. These servers interact with susceptible computers some 550 million times a day. Yet most people don't know they exist, the special protocols that control them, or even the nature of their mission. Major computer manufacturers and operating system developers are also part of the conspiracy: Both Microsoft and Apple have included special code in their latest OSes that lets this shadowy network carry out its mission."
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