It's like the central themes of the text, surrounded by their context, almost leap off the page and hit the viewer like a perspective from another dimension.
Wordle is a neat application that allows you to paste text in and it will create a tag cloud formation with the most used words appearing larger than others.
A wordle created w/ the topic of Peak Oil.
Peak Oil is a common concern and a scientific theory that would be an excellent topic for science teachers from middle school and up to discuss or teach about in the science class.