Science is not the affirmation of a set of beliefs but a process of inquiry aimed at building a testable body of knowledge constantly open to rejection or confirmation. In science, knowledge is fluid and certainty fleeting. That is at the heart of its limitations. It is also its greatest strength.

One, I am skeptical of the effectiveness of nutritional supplements.

We think of our eyes as video cameras and our brains as blank tapes to be filled with sensory inputs.

I just witnessed an event so mysterious that it shook my skepticism.

A Hubble Space Telescope photograph of the universe evokes far more awe for creation than light streaming through a stained glass window in a cathedral.

Religious faith depends on a host of social, psychological and emotional factors that have little or nothing to do with probabilities, evidence and logic.

Smart people believe weird things because they are skilled at defending beliefs they arrived at for non-smart reasons.