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Michael
https://www.goodreads.com/petrifis
Building a SciFi/Fantasy Library
— 3671 members
— last activity Mar 28, 2026 08:51AM
Add your science-fiction or fantasy books to the list, but make sure it's not already there. . .no need for duplicate entries. ...more
Alternate History
— 315 members
— last activity Mar 31, 2026 11:14AM
This group is for those fans of authors such as S.M. Stirling, Harry Turtledove and others who provide us with fascinating "What-If" scenarios in the ...more
The Brain and Mind
— 4482 members
— last activity May 04, 2026 12:28PM
This is a group for readers to recommend and discuss books related to real and/or artificial brains. Categories include but are not limited to: neuros ...more
Science and Inquiry
— 4507 members
— last activity May 08, 2026 09:59PM
This Group explores scientific topics. We have an active monthly book club, as well as discussions on a variety of topics including science in the new ...more
Mathematics&Philosophy&Astronomy
— 338 members
— last activity Oct 04, 2013 05:44PM
you can touch the world, join us. there are a lot of things to know! it doesn't need to be very good at Mathematics,Astronomy,philosophy,... . every ...more
Michael’s 2025 Year in Books
Take a look at Michael’s Year in Books, including some fun facts about their reading.
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