> If we don't know what an object is, then we don't know what it isn't either. Logic doesn't work that way. We don't know all of the things it isn't. We can k

> If we don't know what an object is, then we don't know what it isn't either. Logic doesn't work that way. We don't know all of the things it isn't. We can know many individual things it's not. I know that none of the UFOs in the news are my left shoe.