 here on Earth right at the beginning. And even though the planet was incredibly hot when it was first formed, it managed to remain there. And one of the reasons that we... A number of reasons that we know that. One is to do with the atomic signature of the water that's out in commerce, which doesn't match the atomic signature often of the water here on Earth. But there's also things like we're now aware that there's huge amounts of water distributed through the Earth's crust. In fact, there seems to be a layer of water that...