1. In general relativity, why is there a requirement for spacetime, in the context of the Universe, to expand/contract? It is often said that the theory predicts the Universe to expand, but Einstein missed out on this by adding the 'cosmilogical constant'. But where in the theory is the condition that the Universe must expand/contract? The only way I can see this condition maintained is if the Universe is bounded - and thus has enough matter to ensure a contraction, or energy pressue to expand, but not remain static. 2. Why doesn't a charge increase (like an electrons charge) with velocity, in the same way as mass? Does not a charge have a kind of inertia, or radiation resistance, so therefore must increase for speeds near c?