I also had a physics question recently. I was trying to explain e=mc^2 to my family, and was going to try to give an intuitive example of just how much energy there is in 300,000,000^2 kg*m^2/s^2. I realized that impulse (or momentum), measured in kg*m/s, is much easier for me to conceptualize and explain: a baseball travelling at 30mph has a certain amount of kinetic energy that anyone can experience personally just by catching it. It was much more awkward to try to explain pushing a 1kg weight exactly hard enough to accelerate it 1m/s^2, but only until it had travelled 1m. So if both units can be used to express energy, why do we speak of impulse as so different from energy, and is there an intuitive way to explain the conversion from the 30mph baseball's energy into kg*m^2/s^2 without calculus? I still remember the test question in 10th grade physical science in which I was asked to calculate the work required to carry a 10kg weight across a 10m room. I argued that, at least in the ideal sense, it required no work (if you're infinitely patient), since there was no change in gravitaional potential energy, but the teacher wouldn't budge. I suppose I've resented work ever since. Oh yeah, and maybe Mike Stay could also briefly summarize quantum gravity for us in a way that makes it clear just how that principle works. I was wondering about that, too. -J