There's a lot of valuable information in this book. It's largely comprised of statistics about how the world is built for men, from medicine to government aid to transportation planning.

She does a great job at illustrating how people and algorithms unintentionally perpetuate sexism. It just doesn't come up and frequently the way the world functions has been designed with men in mind. If the people in power continue to be the same people the world has been designed for, they can't even see the problem to begin solving it.

There were a lot of interesting statistics and information, although sometimes they weren't discussed as in depth as I would have liked or she drew conclusions that seemed like a bit of a reach. Like correlation does not always equal causation. It wasn't a problem all the time, but there were more than a handful of instances where I would have liked for her to explain her conclusion from the statistic a bit more in depth.

It seems ironic (to put it mildly) that a book about the gender data gap excludes so many women. There was no mention of transwomen at all and no in depth discussion of any LGBT+ women. That does nothing but continue to perpetuate the data gap that Perez found harmful enough to write an entire book about. I'm not sure how she wrote a chapter about bathroom usage with discussing transwomen's specific concerns once.

There's still a lot of good information in here, which is why I gave it 3 stars, but I can't wholeheartedly recommend it like I wanted to.