Which is why Special Relativity is 'special'. ;)  It only considers the simultaneity of events considering the speed of light to have a maximum value (systems moving relative to each other and clocks). It doesn't consider energy and is only the backbone upon which the next theory was framed.  That's what General Relativity provided - a more thorough description of matter in relative motion - considering energy, mass, time, and so on.

One thing about General Relativity that usually confounds people is that the change in these properties isn't experienced by observers in the frame of reference - only by observers in another frame of reference (thus, Relativity).

Singularities in the mathematic model of a theory are nasty buggers but hard to avoid - Einstein spent a long time trying to remove them.  The good thing is that the singularity only occurs at distance=0 in a gravitational field or beyond the event horizon, the latter being sort of self-explanatory.  What is beyond an area where not even light/energy/information can escape - who knows and who cares - we can never observe what is beyond it.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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