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Project Hail Mary by Andy Weir (audiobook): For the first half of this book, I was completely hooked. It had an amazing story with a huge wow moment in practically every chapter. It went further than the author's more well-known book The Martian by using science to not only solve problems but also reveal mysteries, and managed to be even more funny and endearing in the process.
For the second half, the wow moments were as impactful but fewer in number and the explanation of math and engineering was excessive. For example, there's an entire paragraph about sealing a puncture with epoxy. It describes how hot the epoxy was and how long it had to be held in place to allow it to seal. It could have just said "I epoxied the hole" and moved on. I know many readers love these details, but I mentally checked out and waited for the next plot development.
An advantage The Martian has over this book is that it requires much less suspension of disbelief. A big part of The Martian's appeal, I think, is that we could actually accomplish what was done in it today. Project Hail Mary is far more speculative, but asks really cool questions and answers them plausibly.
While I don't think this book deserves classic status as much as The Martian does, it's a worthwhile read. I'm glad I went into it knowing nothing about the story and that I went for the excellent audiobook version. 6 out of 8 burritos.