We don’t live in a physical reality. We live in the experience of a physical reality. Aliens are everywhere, but they are not physical in the way you think they would be, and as such, they can live in an overlapped state within your own and you wouldn’t ever know. I’ve seen them. Many of them. And yes, they are way more advanced than humans. In fact, the Earth is a facility that they operate. And no, they aren’t all friendly.