Oh, I work on a space station. Humanity has been traveling between different planets for some time now, which I imagine might sound strange. Along the way to being able to do that, we've invented all kinds of things, and shared knowledge between species. People still get sick and injured, of course, but many diseases from Earth are preventable, or treatable if not, and we can replace parts of the body that are too damaged to heal.

Of course, I don't have any of the equipment that allows me to do those things, but they're all possible.