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I try to make sure that students come away
from the course understanding the important fact that there is *no* limit
on "how fast" you can get from one place to another (which is all that can
possibly matter to a traveler) and, therefore, precious little meaning to
the notion that nature imposes any kind of "speed limit."
The fact that
no observer can *measure* a material object to be traveling faster than
the speed of light is a statement about *measurements* of space and time,
not about "how fast something can move."
And since one person's "faster
than light" is another person's "backward in time," all that nature is
really proscribing is causality.