Woohoo for classical physics then! But are you telling me then, Coelho, that if I push the end of the bar the other end won't move for something like a million years? And if so, how can you have the first (lets say) 100 lightyears of bar bent, and the rest of it still strait because the waves haven't reached it yet? Wouldn't this have to result in the iron bar bending a good deal at the mere push of my finger, or breaking altogether?