Why do your feet age more slowly than your head? Is time travel possible? How did spies use clocks to complete secret missions? What caused the year of confusion? Why don't naked mole rats age? Find the fascinating answers to these questions and many more in this book full of mind-boggling facts about time. Ideal for fact loving readers aged 8+. Each book in this best-selling and award-winning series presents 100 bite-sized topics, with bold, graphic illustrations and clear text. Perfect for dipping in and out of, and for sharing with family and friends. Discover more titles in the 100 Things to Know series: 1. 100 Things to Know About Science 2. 100 Things to Know About Saving the Planet 3. 100 Things to Know About Music 4. 100 Things to Know About Numbers, Computers & Coding 5. 100 Things to Know About Food 6. 100 Things to Know About the Human Body 7. 100 Things to Know About Space 8. 100 Things to Know About the Oceans 9. 100 Things to Know About Planet Earth 10. 100 Things to Know About History 11. 100 Things to Know about the Unknown 12. 100 Things to Know about Sport 13. 100 Things to Know about Wildlife