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And this is another argument that's used from time to time regarding why we are not seeing advanced civilizations. It goes something like this. A civilization evolves to the point where it ends up destroying itself for a few reasons. They put their planet to the point of extinction. They fight wars, maybe a version of a nuclear war, or they out-populate the resource capacity of their planet. So there are a whole host of reasons why they wipe themselves out. But what it comes down to is that a civilization gets to a point in its evolution where it is not careful, it ends up wiping itself out. And that also plays into another aspect of that same argument, that some civilizations, they may have got to the point where they're evolving, they realize that if they evolve too much further, they end up wiping themselves out. So therefore they stop. They stop their technological evolution at some point. So that means there could be advanced civilizations out there, but they stopped at some point and they're sort of hidden. They're hidden in the cosmos now. We don't know they're there, but very likely they could be.