Danny Hillis: The Internet could crash. We need a Plan B | Video on TED.com

We have so many problems to solve. Some are challenging, Some are easy. Not all of them are sexy. Some are just-in-case type things that may never even be needed. Yet, often, those are the most interesting to solve.

For what does it feel like to build something that you hope you will never have to use yet you build and test it relentlessly just in case you do?

This is one of those and I find it particularly fascinating.