If gravity can bend matter, then how much gravity is needed in order to break glass?" Gravity does not "bend matter". You can place a ring of glass entirely around the Earth, in orbit, and it will not break "If gravity can add up and bend matter, then there has to be an amount of gravity needed to entirely bend different forms of matter."
It isn't gravity, you are thinking about supporting the matter, say at one end, and displacing the matter off its force-free path (aka. Falling"), such that the matter fails to be supported that way. We build structures all the time, that cannot support the weight placed on them: http://en.wikipedia.org/wiki/2003_Chicag... "If light is utterly bent when confronted with enough dark matter," Light is not bent.
Light follows the straightest possible path, in curved spacetime. Straightest possible. "then how much gravity is needed in order to completely break a glass cup?"
Take a standard glass cup, use the same amount of mass (so it gets thinner), and increase the dimensions (height, diameter, handle geometry) about 50 fold. The cup handle will break when you try to lift it, it will separate at the top of the handle where it connects to the cup proper. Now you may be thinking about in the Earth's crust, where solid rock is basically pressurized into a fluid... http://www.google.im/url?sa=t&rct=j&q=&e...
Gravity bends space; not necessarily matter. How much gravity to break a glass cup? Try it.
Hold it at about 7 feet high (over your head), and drop it onto a concrete floor. I'd recommend wearing shoes and goggles for this experiment.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.