Mass, Energy, Inertia and Gravity

The dirty secret of why you are not quite as heavy as you think The kilogram is getting heavier, which means, correspondingly, that we are all getting ever so slightly lighter. The official kilogram, a small lump of platinum-iridium in a vault in Paris, has been slowly and somewhat mysteriously gaining weight over the course of its 137-year life. But because, philosophically speaking, the official kilogram always weighs a kilogram, the practical result is that everything else is apparently not as heavy as was thought. What people are taught in school about Mass, energy, inertia and gravity is probably good enough But even undergrad physicists aren't given the whole story. And it's because, when we focus on it, we really Do not understand the intricate complexity and relationship between these items.