Thank you! I subscribe to the Nature email newsletter and really like the book reviews they've revived relatively recently. Last week I stumbled upon the Science book review blog and thought it would be amazing if more journals did this type of general interest book reviews, and if these reviews could be aggregated for easy browsing. There are plenty of outlets for reviews of literary nonfiction, but not so much for popsci-type books in my experience.
I started with those two sites, then found the LSE one and reviews.ac.uk (a history book review site which I have yet to include). IEEE spectrum also has a book review section but it's very sparse, so I didn't bother.