I've written a picture book for kids about critical thinking and mentioned Occam's razor in it, as I think children as young as eight can begin to grapple with the complexities of critical thinking. It's always the best place to start. The first major question to follow should be: What else has to be for this to be true?

For example, take UFOs. For UFOs to be real, as in from another exoplanet, some other intelligent race of creatures far superior than humans had to conquer the complexities of interstellar space flight, built space ships that can cross that vast distance, presumably found a way to go faster than light speed...and do all that just to reach Earth.

Or, UFOs are misidentified and misunderstood phenomena here on Earth.

You have to swallow A LOT to believe in little green men. There is a lot of talk about it, but very little evidence. You can choose to believe as a matter of faith, of course, and you can identify your faith as fact if you want. But technically, it's faith, and it's makes far, far greater sense that we just don't understand our own planet and its workings. Heck, we haven't explored 75% of the ocean yet. We know more about the moon than we do our own oceans. There are plenty of mysteries yet to be uncovered to keep scientists busy.