Scientific discovery is more complex than simply observing the physical world. How we observe and how we draw conclusions is driven by the human imagination, says Mr. Shatner. The dramatic change in certain scientific conclusions provides evidence, from governmental dietary guidelines to the persistent mysteries posed by fundamental physics. That 98 percent of the universe remains shrouded in mystery — scientists call it dark matter — is proof enough that our universe is more profound than our minds. Or perhaps our minds are more profound than we tend to realize. Shatner's newest book is Leonard: My Fifty-Year Relationship with a Remarkable Man.