moybien

I've heard physicists say that our universe is probably infinite or that it probably doesn't have an edge. If the multiverse in the context of cosmic inflation is right, then does our "pocket universe" or "bubble universe" have an edge?

Popular explanations of GR usually resort to a bad analogy with a large ball on a trampoline that curves the surface, causing a marble to move closer to the large ball. But the reason the marble moves is because of the earth's gravitational field in this analogy. I've heard Michio Kaku say that "space pushes" him onto his chair, but that is an oversimplification as far as I can tell. How does gravity really work in GR?

I've heard physicists say that the gravitational force is carried by the graviton. I know that in general relativity the gravitational field is spacetime itself. So is the graviton the fundamental constituent of spacetime or is it a particle in spacetime?

Dr. Gupta, I'm considering the vegan diet. I'm having a hard time finding reliable information on the internet because a lot of it is contradictory. What are some potential health risks I should be aware of and what supplements would I probably have to take? Most of all, where can I find reliable information online?