6,350 books
—
7,072 voters
Science and Natural History
— 1135 members
— last activity Sep 22, 2020 01:21PM
This group is for those that just can't get enough of science and the natural world. *** All books are chosen by group members *** ...more
Space Elevator – Help LiftPort build the Lunar Space Elevator Infrastructure
— 31 members
— last activity Jun 03, 2015 09:00AM
To build “the biggest thing, ever!” – LiftPort’s Space Elevator – requires an enormous breadth and depth of knowledge. Naturally, there are technical ...more
The Readers Review: Literature from 1714 to 1910
— 3784 members
— last activity Apr 26, 2026 08:51PM
This is a group for discerning readers looking to discover, explore, and critically discuss some of the World’s literature, with a primary emphasis on ...more
Free Kindle Ebooks
— 1778 members
— last activity 22 hours, 44 min ago
This is an extension of the web site http://FreeKindleEbooks.com where nearly every week you can get a list of the best "selling" free Kindle book tit ...more
Penn Alumni
— 26 members
— last activity Sep 07, 2014 10:25AM
A group for Alumni of the University of Pennsylvania.
Penelina’s 2025 Year in Books
Take a look at Penelina’s Year in Books, including some fun facts about their reading.
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