I have a large collection of bookmarks. The Book Depository is at the moment sending out some rather nice ones with all its books.
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I finished Gravity's Engines by Caleb Scharf. The author is astrophysicist, rather than a theoretical physicist like the authors of the two previous popular physics books I listened to (A Universe From Nothing, and From Eternity to Here), which made an interesting difference. It was about black holes, the history of their discovery and how they influence the formation of the universe. It was pretty good in describing the physical reality, scale, contents of the universe and there was some really great stuff like white dwarfs and quasars, but some of the explanations were a bit overburdened by metaphor.
I also finished Superintelligence by Nick Bostrom which for the most part was totally ace. I'd never seriously considered AI to be a big concern for the future, but Bostrom was pretty thorough in his arguments. Much of the book reads like science fiction, and anyone interested in reading - or writing - sci fi should very definitely listen to it. It was mostly about the Control problem, full brain emulation vs true AI, singleton vs multi polar superintelligence etc, but also lots of stuff like a society of emulated worker brains (what rights do they have?), turning the galaxy into computonium in order to calculate Pi, etc. The language/ style is quite academic, and it's unlikely I would have finished it if I'd actually read it, but it was totally fine listening to it. I did think he overlooked a few alternative arguments in order to plump for his own conclusions on occasion, and he seemed to have an odd view of how society worked at times, but those were very minor quibbles and very possibly my own error.
I also finally finished The Unreal Life of Sergey Nabokov, by Paul Russell. Russell is one of my favourite authors and I'd been saving this book up. It couldn't live up to expectations. It's a fictional life of Vladimir Nabokov's brother, covering life in Russia before the Revolution, then mostly Sergey's life in Paris between the wars, and during WWII in Berlin. The main problem I found was that Sergey basically seems to drift though his life (this may have been the point, but still), and all the famous people he meets in Paris (Cocteau etc) were pretty horrible. Vladimir Nabokov also came across as a dick. Russell has apparently taught courses on Nabokov and I think this book probably echoes things in Nabokov's work that I didn't pick up on, only having read Lolita and Pale Fire. It made me want to read all Nabokov's other stuff, minor work included. Russell is great at evoking certain emotions, and there were some great bits, like Sergey's loneliness and unpopularity as a teenager, his longing for closeness with his father and brother, but it didn't quite reach the height of some of Russell's other books. It was still really good, though. The period and events in the book were all really interesting and well done.
I am currently listening to The Physics of the Impossible by Michio Kaku. It's good fun so far.