Because throughout history, every mystery ever solved has turned out to be... Not Magic
-- Tim Minchin, Storm
That could just mean we're no good at solving mysteries that involve magic.
Also, I think there is a selection effect in so far as there are solved mysteries where the solution was magic; however, you'd probably argue that they were not solved correctly using no other evidence than that the solutions involved magic.
Here's the new thread for posting quotes, with the usual rules: