 Because things in space behave in a way that we as humans on the ground, we're just not used to, we don't understand. And because space is such a hostile domain, very few humans can be in it, and very few are. And so we as squishy cans of meat, if you will, if we're out in space, it's very expensive and very difficult to sustain us, to keep us alive, to allow us to be productive. And then for anything else when you're talking about to include war or conflict,