Thank you for the replies :smile:
Ahh I see, so the initial movement of the bar would travel the length of the bar like a wave, moving from atom to atom at the speed of sound in that material ?
Summary: Can the speed of information be faster than light?
Say you had two people in space and they were 10 light years apart. Each person has a light bulb and battery connected to an electrical switch. Pressing the switch turns the light on, once it is released it springs back to the off...