This was another time travel/loop novel where I’m not entirely sure what happened but I enjoyed it. It’s also got a Wikipedia aspect, done well so I’m a fan. This connects two time periods: 2016 Bay Area and 1930s Vienna (including the political upheval and the rise of fascism) with a few side visits to other times and places. I liked getting to experience both of the main places/times through this novel which is about math and power and who actually gets to write history. Strong female characters round it out, though the message is ultimately about, in some ways, the invisibility of women.