The main takeaway from this book is never to trust what people think studies say. Always read the study and look at the data yourself if you really want your opinion to be based on fact. Once you dig into it, you’ll find people making the weirdest assumptions or failing to account for their own bias. Fine mentions study after study that have been overinterpreted and misinterpreted due to faulty premises in the whole experimental set-up. I wouldn’t suggest that you take Fine’s word for it: even though she points out some fallacies, no doubt she falls into some of her own. That’s the nature of humans, and that’s why peer-reviewed and replicated science is so important.
Nonetheless, there’s a lot of fascinating stuff discussed and she makes her points clearly. It mostly accords with what I understand about differences between sexes, and overall I found myself nodding a lot (probably a sign you should also treat anything I say about gender difference with caution — I have strong pre-formed opinions that are already fairly in line with Fine’s). I found her entertaining, as well as clear, which is always a plus in a pop-science book as long as it doesn’t go too far.
If nothing else, if you want to dig into the topic this book is good for context, and has a wealth of notes and sources you can follow up. If you do believe that there’s an in-built difference between the sexes for biological reasons, you might find Fine a bit too stringently against the evidence on your side, which she spends a lot of time dismantling. That might be a bit infuriating for you, so if you’re just looking for the facts, go straight to the source.