I'm a true believer in pure science. But I also enjoy speculation. Sometimes (not always, and not even often) the craziest far out ideas are what turn out to be true. (e.g. Alfred Wegener)
Yes, we know a bleeping lot. And crackpots like Depak Chopra who throw around words like "quantum" to justify nonsense are ridiculous. But there's also a bleeping lot we don't yet know.
As our circle of knowledge expands, so does the circumference of darkness surrounding it.
― Albert Einstein
And don't forget Clarke three laws (quoted from Wikipedia):
Clarke's Three Laws are three "laws" of prediction formulated by the British science fiction writer Arthur C. Clarke. They are:
1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
3. Any sufficiently advanced technology is indistinguishable from magic.