I'm taking a networking class in my CS program and one of the (at least,
I think) interesting topics we covered was the distance issue when linking two nodes together on a network. We got around to talking about really big networks (like the Internet) or a hypothetical Earth+Moon Future Internet. Another student and I had our dreams of low-grav YouTube broken when the teacher showed us the more gritty parts of how two nodes talk on a network, namely the round trip delay. This article sounded really neat and made me remember that NASA usually comes up with some very interesting workarounds/solutions.
(This is my first contribution to HN after about a year of lurking so I thought I'd make my post a bit more meaningful and explain why I thought this was neat.)