Re: Faster than light
I have even better gedankenexperiment for you.
Imagine giant scissors hanging in the vacuum of space. They can be as large as you like, even greater than our Galaxy. They are as rigid as baryon matter lets us but it is no problem as they are powered by rocket engines ingeniously placed along them. We can program them to make the scissors cut as fast as we want. The only limit is that the points have to move slower than c.
It is easy to calculate that the Space Scissors can cut much faster than light without breaking relativity or causality. The engines have to be programmed before the cutting stats and the signals along the scissors cannot travel faster than light. But if you start with sufficient time to spare you will succeed in all the segments of the scissors moving in perfect unison.
So it is possible to create an effect moving faster than light without transferring any information with super-luminous velocities.