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And that goes back to my mention of von Neumann probes. There's an example of where von Neumann probes would come into play. And so that's a long enough time, but it's less than 10 billion years, or even the 4.6 billion years that our planet existed. So in theory, Earth has been around, you might say, long enough, so we may have received, let's say, dozens of visits from extraterrestrials, or messages of some sort. Enrico Fermi, he asked, there's a famous quotation from him, where is everybody? There's nothing.