You already know that you have one nose, two hands, and five fingers on each foot, but did you know that your body has a total of 206 bones, about 86 billion brain cells, and more than 30 trillion other cells? Additionally, that there are 100 trillion bacteria inside and on your body that keep you healthy?

Why is your brain so large? And what are long-term and short-term memory? How does sleep help you, and how many hours should you sleep?

Why can't you choose who you fall in love with? And how can you tell if someone is in love with you? What are hormones? And what impact do they have on your body, your desires, and your behavior? Is it true that they also affect the course of the world and history—causing disagreements and wars?

What is inside your cells? Why can a tiny virus destroy an entire cell? What are the defense mechanisms of your body? Why is your body temperature always 37 degrees Celsius?

What is the role of blood? Did you know that to stay alive, you need 3 million new red blood cells every second? And that your heart is a machine that beats about 100,000 times daily and pumps nearly 8,000 liters of blood throughout your body? How can you exercise your heart muscle?

Why should you brush your teeth before eating? Why is it a shame to throw away your urine? Why is it good to hug each other?

Why did Cleopatra put poison in her eyes? What do you know about oocytes, sperm, and the female reproductive cycle? And do you think that future medical research might lead to the development of artificial organs so that we don't die from diseases or old age?

These are just some of the dozens of questions answered in this impressive and entertaining book for young and adult readers who wish to deepen their knowledge of the structure and function of the human body, traversing the fields of anthropology, medicine, and psychology.

The book is already available in 9 European languages (Dutch, German, French, Italian, Norwegian, Polish, Spanish, Bulgarian, and Greek), in Russian, Chinese, Korean, and Turkish, and has received multiple awards. The author and illustrator have received many honors for their overall work.

In 2024, the other two books in the series were released, (1) The Mystery of Life: A Journey into the Depths of Our History and (2) The Secrets of the Universe: How Everything Came from Nothing.