Hi everybody. I have always wondered something and have not been able to get an answer. Let us suppose we have a 300.000 km long straight rod. It is of graphene, or any very tough material, of absoulte stiffness, without any displacement or absorption between its molecules. Parallel to the rod I have a laser light. The laser is in the A end of the rod. In the B end of the rod there is a button, the rod is touching the button but not pushing it. Aside the button, there is a optical sensor that can detect the laser light. If I push the A end of the rod and simultaneously turn the laser on, the sensor will receive the siganl one second later, and the button in the B end of the rod... wil be pushed instantly?