This page is the destination of the text reference links in the Thoughts on SETI selections. I guess you could call it a glossary, although it is a little more explanitory than is usually the case for glossaries. In any case that's why it has no return link. ( just noticed that did you ? ) You need to use your BACK button. That way you wind up back where you left off in your reading.
If I failed to include anything that you think might be useful please let me know.