Hi, since I don't have exact knowledge about materials and particle coupling, I want to ask for result of simple experiment: imagine you have very tough stick 10 meters long. Let's say the stick is fitted on firm steel table in sliding blocks. Table is equipped with actuator strong enough to shift the stick, which will push one end of the stick. On the second side of teh stick in very small distance is detector, which will detect the stick contact. So how fast will be information transferred from actuator to detector (let's say by push we transfer 1/2 of a bit)? Of course it depends on velocity of actuator shift, distance between detector and second side of stick. This is known. But how fast the change of space coordinates on one side of the stick will appear on the second side? How fast inbetween joins of atoms can react? Are they also limited by relativity limits? Thanks for answer. P.S. try length of te stick 10meters, distance between detector and stick 1um, actuator velocity 30m/s.