Duality is one of the most important insights in physics and philosophy of physics. What does duality mean? It means that there are dual descriptions of one and the same observed physics. Duality implies that you cannot possibly decide whether the one description T or the other, to T dual description T’ is right or wrong, because both descriptions lead to the exact same observations for the observers who live in a universe that can be described by the theories T and T’. Both are equally right or wrong, as they are dual descriptions.

My main computer died, and I'm on my backup system.  While I can still work, it feels like I've shifted from my starship bridge to the tiny emergency control room, while still on full battle alert.

I have many working computers in the house.  Between my main (a linux PC), the Windows box (for when you absolutely need 100% Windows compatibility), the 2 netbooks, and the music/vid box, I can 'do' stuff.  I just can't do it as seamlessly, and that's caused frustration.