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be this invisible matter that's comprising almost all the universe. Like the material we see around us, we experience, we interact with, that only takes up about 5% of the universe, the entire universe that we observe. Then there's dark matter that takes up around 27, 28% of the universe. So this is the missing matter. It doesn't interact with other matter. You can't do any experiments to detect it. We detected it indirectly, at least so far. Dark energy is dropping. Dark energy can refer to that as the cosmological concept. This is a force that's caused us to expand, not just expand, but it's expanding and accelerated rate. And so we're learning more and more about the two of these, as time goes on. And as I said, at one point, they were thinking in terms of the two are very, very independent of each other.