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Where do birds sleep? We see birds flying across the sky, perched on the branches of trees and bathing in puddles. But where do they sleep? When it comes to choosing a sle... When did dinosaurs live? They roamed the Earth millions of years ago, often leaving giant footprints as they traveled the land. Thud! Thud! Thud! “Dinosaur” means... What is the biggest book in the world? Can you hold your favorite book in your hands? What if your favorite book were bigger than you are?! If this book happened to be about the Aggtelek N...