[mihaic]

I've got a strong objection with "You don’t really understand something if you can not explain it using simple words."

While understanding and being able to give a simple explanation are correlated, this statement doesn't take into account that some understandings are deeply personal, require a pre-existing experience, or maybe a minimum level of intelligence on the part of the other person.

This type of reasoning usually makes me think the people doing it are clueless about life in general but are merely academically inclined.