Breath, by James Nestor. I found this fascinating. Had no idea mouthbreathing was so bad, or that people naturally had straight teeth up until a few hundred years ago. Some parts were harder to believe than others — fixing scoliosis with breathing techniques, staying warm in very cold temperatures by breathing differently — but overall it was an interesting book. Worth reading.
Spelunky, by Derek Yu, about the development of the titular game. Fun read, enjoyed it a lot. Made me want to write a roguelike.
Fiction
Whalefall, by Daniel Kraus. Read it for book group. Whew. Intense and a bit uncomfortable. Lots of concrete detail, though, and I learned a lot about scuba diving and whale anatomy, and the character work was good.
Down Among the Sticks and Bones, by Seanan McGuire. Novella. Crackling with danger and a lovely dark fairy tale atmosphere. There were some parts I didn’t like, but the rest was good. It’s been long enough that I’d completely forgotten that these characters were in the first Wayward Children novella as well. Interested to see where the series goes.