Starting to read "Summa Technologiae" by Stanisław Lem

I have found a link to "Summa Technologiae" in one tech discussion a few days ago. Book looks like a good reading for folks interested in hard science fiction.

https://en.wikipedia.org/wiki/Summa_Technologiae

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Note for myself: next candidate to read - "Tau Zero" by Poul Anderson.