Steven Tran did a fantastic job organizing and categorizing the information he cited. As a science major, I have a real appreciation for the data he gathered and the system he recommends at the end of the book from the accumulated data he brings to the table. 5 stars as a meta-analysis, and 5 stars as a nice way to quantify language learning without adages, but facts.
I'm pretty sure I discovered this book from some Reddit post a week or two ago in one of the many language-learning subs. The concept behind this book is perhaps perfect for my interests! I get that its audience is arguably rather niche (based on its very research-driven content), but I am nevertheless surprised that I haven't come across anything quite like it before, and am equally surprised that it doesn't seem to have gained much traction on Goodreads (it is new, though, so hopefully this'll change).
I really felt very much at home reading this. It methodically draws from a lot of research surrounding language acquisition, and presents it all in a very light way. Instead of seeking out the research yourself and trudging through it, which can be very interesting, but equally very time-consuming, the Author has done this for you; you can get all the insights in a minimal amount of time (the point of most nonfiction books, duh). I particularly found the closing chapter to be a great idea - it draws on the research in the book to provide research-backed recommendations for a self-study plan taking the learner from absolute beginner up to an advanced level (even if I would personally adjust this plan in some areas if I were implementing it into my own self-studying). It's a great wrap-up to the book, applying what has been discussed rather than merely summarising it again with some implicit suggestions or something.
Great little read for any relatively motivated language learner, and I'm sure I'll be recommending it on Reddit here and there! Nice job.