You are invited to read this to brush up your memory: https://www.amazon.com/Middle-earth-Science-Collection-Discussions-barbarians/dp/B09P7RNBQS :-)
Link that works. https://www.amazon.com/-/de/dp/B09P7RNBQS/
Also included in this recent omnibus edition:
https://www.amazon.com/-/de/dp/B09P7RNBQS/ref=tmm\_hrd\_swatch\_0?\_encoding=UTF8&qid=1660206299&sr=8-1