Your child will happily read a whole almanac but rolls their eyes at anything made-up. Any one of these books works on its own. Some are pure fact books to say yes, this absolutely counts. The rest are true stories and gentle adventures that keep one foot in the real world your child trusts, so a story stops feeling like a trick. Pick the one whose topic your child already loves, and hand it over.
These are a spread of doors, and every one keeps a foot in the true world a fact-first child trusts. Two of them, the almanac and the shark showdown, are pure fact books, and they're here on purpose: to tell your child that yes, this counts as reading. The rest lean a little more toward story while staying real or nearly so, a biography of Einstein, true animal rescues told like a novel, Ms. Frizzle's science-packed field trip, a girl mad scientist saving the day, and, furthest across, a dinosaur adventure with real dino facts stitched all the way through. You're not marching your child from fact to fiction. You're setting out the whole shelf and letting them pick by what they already love, sharks, the human body, dinosaurs, a real genius, and letting the story sneak in on the back of the facts.