Two faster-than-light questions.
Imagine a bike chain wrapped around two gears and the gears are turning together. Now imagine the distance between the two gears is half a million miles. Neglecting the amount of force required to stop it's inertia (by assuming you've got a really big lever and arm to stop it), if you were to stop one gear, would the other gear stop at exactly the same time?
Second, imagine you have a crystal with a perfect lattice structure (say, diamond), also half a million miles long but only a few inches wide. If I were to twist that crystal at one end, would the other end twist at the same time?
Is there any real-life scientific principle that suggests that FTL is possible?