Levy's Law

The truth is always more interesting that your preconception of what it might be.

In journalism, this means that the best practitioners should not have the stories written out in their heads before they report them. Preconceptions can blind you to the full, rich human reality that awaits you when you actually listen to your subjects and approach the material with an open mind. It wouldn't surprise me if the same tabula rasa principle applies when scientists try to answer the big questions.