The answer to the question of why matter causes spame-time to curve is where we must look to new theories that will unify Quantum Mechanics - which models the behavior of the sub-atomic particles and the fields affecting those particles - and macroscopic theories like GR. We have string theory; quantum units of gravity, such as a graviton; quantum loop gravity - attempting to model gravity as a fundamental force consistent with the other forces modeled by QM.
Matt
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Let me close by telling you what I hope to get out of the national dialogue that these committees are fostering. I am not really helped by being reminded that I need more Arabic linguists or by someone second-guessing an obscure intercept sitting in our files that may make more sense today than it did two years ago. What I really need you to do is to talk to your constituents and find out where the American people want that line between security and liberty to be.
-NSA Director Michael Hayden, statement before Congress