It's a blog! Mainly of book reviews.
Unfortunately, unlike its series companion about Einstein (by a different author) I can't recommend this book, even to its intended age group.
Most seriously, there are factual errors: Darwin was not the official naturalist aboard the Beagle. That role was taken by the ship's surgeon (as was often the case), who, jealous of Darwin, quit at the first opportunity and sailed home. (Fortunately FitzRoy was able to hire a new surgeon before continuing the voyage.)
Secondly, there are typographical problems that go beyond just the occasional spelling error into missed and repeated parts of sentences.
Thirdly, in a book that has separate, boxed definitions for such concepts as "geology", words like "ecosystem" go by without any explanation at all.
Not good, which is a shame, since Darwin and his science are so enormously important.