Internet via the power line

The last hotel I was in offered wired internet to all the rooms. The real cool thing was that they didn't do this through a cable or DSL modem. Instead, the internet signal traveled via the power lines, so that the modem was simply plugged into the wall socket:
Over cocktails, I tried to explain the internet delivery mechanism to another guest at the hotel but she was not a tech-nerd and couldn't grok how cool this was.
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  1. Lost some cred with me here Lak. Your friend...R

  2. I know ... I know. But I hadn't seen one of these power-line modems before until you pointed it out. Oh well, I guess I'll have to earn back some geek cred.