A brief history of the human body

Your body is 3 billion years old!

An encyclopedia of the human body from head to toe, from the inside to the outside, from 3 billion years ago to today!

The genes that make your body have been there since a single-cell blob floating in a shallow ocean three billion years ago. These genes may come from fish in the water, birds in the sky, or even extinct dinosaurs. It took 3 billion years to create the unique you:

You are the only animal with jaws; the only creature that sheds tears for emotion; and the only mammal that sends air and food down the same tunnel.

The ridge of your brow no longer protrudes forward, replaced by small and personable eyebrows;

Your body retains the memory of sleeping on a tree, so you won't fall off when you sleep in bed;

Your brain is much smaller than it was 10,000 years ago, but it can process more information in 30 seconds than the Hubble Telescope in 30 years;

Your thumb has three more tiny muscles than a chimpanzee's, so you can grip tools more powerfully, leading to great human civilization...  

However, the results of 3 billion years of evolution are not all good, and many of our pains today are also related to this long process:

Walking upright makes us suffer from back pain and knee pain all year round;

In order to move more conveniently, our pelvis becomes smaller and becomes the most painful creature in nature;

The speed of human evolution can never catch up with the speed of virus mutation, so we will always be at a loss when facing viruses;

Cancer is the price of evolution, because without cell mutation, we would never get cancer...

Open this book, start from single-cell spots, and look at the evolution history of your body over the past 3 billion years!