One technical issue that often plagues me is that you can't make the speed of light any faster. Network latency from NYC to Sydney is going to suck no matter what. Helping users understand this is difficult. Often it is equally difficult to make software developers understand this too. Many times people have asked me, sometimes seriously, if we could just make the speed of light faster.
There is one obvious way to improve the latency between NYC and Sydney: Tunnel through the earth. A direct route would be much faster.
However it looks like scientists are close to a more realistic alternative: use air instead of glass!
"The speed of light, about 300,000 km/s, is the speed light travels in a vacuum. In a medium such as glass, it goes about 30 percent slower, a mere 200,000 km/s."
Here's the full article: http://ars.to/15SOcj9
If you aren't sure of the difference between latency and bandwidth, ACM Queue magazine's George V. Neville-Neil wrote a good description.. Here's a video explanation from Digital Society. I'd love to work with an animator to make an educational video demonstrating the difference between latency and bandwidth.