I've always had a passing interest in UFOs and similar mysteries. The sense I get from reading a bit into the subject is that when you subtract the obvious cran

I've always had a passing interest in UFOs and similar mysteries. The sense I get from reading a bit into the subject is that when you subtract the obvious cranks and cultural mythology there does exist a hard core of very hard to explain UFO cases with hard evidence associated with them. It's a minority of cases overall but they do exist. The evidence isn't strong enough to confirm any of the leading hypotheses (ETs, classified tech, etc.), so they still remain in the mystery category. A common misconception about a basically scientific worldview is that you can't have mysteries, that everything has to be settled. This is absolutely wrong. Of course there are mysteries. If there weren't, science would stop. I'm perfectly comfortable with mysteries and with answering "I don't know" to certain things.