How much did Apatosaurus weigh?How big was an apatosaurus’s brain?How big was an Apatosaurus egg?How long did it take for an Apatosaurus to grow up?Learn the answer to these questions and many more fun facts in this 15-Minute Book. Apatosaurus are one of the biggest dinosaurs ever discovered.. How much do you know about them?Ages 8 and up. This book is also included in the compilation 101 Fun Facts About Dinosaurs.LearningIsland.com believes in the value of children practicing reading for 15 minutes every day. Our 15-Minute Books give children lots of fun, exciting choices to read, from classic stories, to mysteries, to books of knowledge. Open the world of reading to a child by having them read for 15 minutes a day.