By National Geographic Kids
A fat book of facts sorted into topic clusters, so the child who's into sloths gets a whole run of sloth facts at once instead of just one.
Twenty-five facts about bioluminescence. Then a spread on wildfires, then gravity, then royalty, then bubblegum, then breakfast, then aliens. Two hundred and twenty-four pages of it. The facts come grouped by topic and packed around photographs and cutaway diagrams, so when your child lands on the sloth spread they get a whole run of sloth facts in a row instead of one and then a swerve to volcanoes.
The difference between this and the little pocket fact books is that grouping, and for the right child it matters a lot. A single random fact is a firework. Twenty-five in a row on one subject starts to add up to something a child can hold onto, so the one who wants to be the sloth expert can actually get there in a sitting. It's also thick and heavy. That sounds trivial, but a child who's been told fact books don't count now gets to carry around something that looks every bit like a real book.