I always hear about one of Arthur Clarke's three laws of prediction, that "any sufficiently advanced technology is indistinguishable from magic."

The other two are just as interesting, if not quite as pithy and memorable.

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.
The only way of discovering the limits of the possible is to venture a little way past them into the impossible.