I still have enough trouble simply trying to undo them,
but they could be a very rewarding project to try and tackle.http://www.msnbc.msn.com/id/21018119/
Seriously, I just thought it would be fun to post. But perhaps there are DIY methods that might work for smaller sizes. Also, for the more demanding sizes, even though some of us might never get a chance to go there (not unlike formula one racing and space exploration), there might be some technologies that could be applied to other more humble projects, like backpacks, or hammocks, or suspension bridges.