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General relativity, it's like a shopping list really, I guess. It's got three main categories to it. It's the geometry of space-time, that's the warps and curves in space. So gravity, in other words, because gravity is what causes the warps and curves in space. Distribution of matter across space, and that's the source of gravity. And again, that's the cause of warps and curves in space, too. And the amount of energy within the fabric of space-time. And every cubic meter and centimeter of space contains energy. You can't vacate any amount of space of its energy. So that's the three main categories of general relativity. So general relativity mainly covers gravity and its effects and its origin.