You can count numbers all around you, from the eight legs on a spider to the one nose on your face. But can you count the stars in the sky or the fish in the Amazon? Find out all about the THE HUMAN BODY in THE BIG COUNTDOWN, including the millions of bacteria that live in and on us and help our body function healthily, our digestive system, our bones and muscles, our blood and heart, our lungs and breathing, the size of our brain and the number of hairs on our head. It also covers the human life cycle and the development of a foetus in the womb.

The Big Countdown looks at popular topics and investigates the great many numbers that make them fascinating. From the mind-bogglingly large to smallest and most precious, this series helps us understand that it's not just our days that are numbered.

This book is part of a book series called The Big Countdown .

There are 32 pages in this book. This book was published 2016 by Hachette Children's Group .

Mark Ruffle studied graphic design and then worked as an art editor for Oxford University Press, before becoming a freelance illustrator and designer. When he's not drawing animals or spaceships, among other things, he enjoys walking his dogs and cycling in the Cotswolds, where he lives with his wife and two daughters. Since landing on planet Earth, Paul Rockett has spent much of his time reading up on the adventures of human life, while also experiencing a few of his own. In his quest to find out more about his chosen home planet, Paul has travelled, doodled, eaten a lot of food, plundered dusty libraries and gazed out of windows. Having gathered together a vast amount of fascinating data, it is now his mission to present as much as he can in interesting ways, so that any passing Martian can see how brilliant life is on Earth.

This book has the following chapters:

• 1: Counting down the human body
• 1: There are 100 trillion good bacteria living in the human body
• 1: There are 58 billion, nine hundred million skin cells on the human body
• 1: Blondes have one hundred and forty-six thousand strands of hair on their head
• 1: The heart beats one hundred thousand times a day
• 1: Blood travels 96 thousand and five hundred and sixty kilometres a day
• 1: We take 20 thousand breaths a day
• 1: More then six hundred muscles in your body
• 1: 206 bones in the human body
• 1: 12-72 hours to digest food
• 1: Nine months for a baby to grow in the womb
• 1: Five senses
• 1: The human brain weighs 1. 4 kilograms
• 1: Large numbers and further information
• 1: Glossary
• 1: Index