Ok, so I've been listening with enormous interest to the Big Bang episodes and I have two questions. First, the CMB and it's variations. What is the best way to visualize the nature of the variations in the CMB? In my head, I'm seeing it as a sort of topological map of energy levels where some areas in the volume of the universe have higher levels then others. Measuring our own local energy level seems easy enough. How do we 'see' into other volumes? Is a thermodynamic/fluid model totally wrong?

Second, on the matter of measuring deuterium in stars and comparing them to the expected values from the Big Bang. If stars rapidly consume deuterium and covert it to helium, how is there any deuterium in a star to measure?