Heaven Makers
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The story deals mainly with psychological aspects of humanity and at the same time with the concept of immortality.
Quite interesting ending where Frank Herbert share is views on both topics. It's a nice reading, fast and what you can expect from herbert. Dealing with nowadays standard is considered a novella, with 150 pages, and outdated. But for those who want to read the primordials of Sci-fi give a try with this one.