The most persuasive book on why humans began to walk on two legs

Today I'd like to introduce a book for the first time in a while. I've been carrying it with me on every business trip recently.
After reading it, I was able to acquire knowledge that I had never known before, so my brain was really refreshed.
I feel satisfied.
Civilization began when humans began to walk on two legs and use fire and tools.
Even elementary school students know that this is what is said.
However, until now, no clear answer has been given as to why humans began to walk on two legs.
I don't think I've come across any theory in the books I've read in the past.
I found a very old book called "The Origin of Woman: Another Theory of Human Evolution" very interesting.
This book describes the process by which humans evolved from a common ancestor with apes such as chimpanzees.
By temporarily adapting to an aquatic life, they have developed upright walking, thin body hair, thick subcutaneous fat,
Features not seen in other primates, such as the ability to consciously control breathing
The hypothesis is written that the
However, this theory is completely anti-mainstream and has no credibility.
Being credible seems to be on a whole different level.
The book I read this time was "BORN TO RUN". The Japanese title is "Born to Run".
When I first started reading, I was struck by the idea of an ultramarathon, a long mountain trail that easily exceeds 100 km.
I thought it was a book about running a marathon. The text was extremely difficult to read.
I was thinking of quitting, but then halfway through it suddenly took a turn and became dramatically more interesting.
First of all, bipedal walking was not initiated in order to use tools.
They evolve to survive. In fact, it wasn't until they became bipedal and started using tools that they evolved.
It took tens of thousands of years. This means that bipedalism was an advantage in the race for survival.
It seems that.
- Bipedal walking is inherently disadvantageous in terms of thrust, stability, and air resistance.
The maximum running speed is much slower than that of quadrupeds. Nevertheless, bipedal walking has the advantage in the survival race.
This means that there was.
・There is a crucial difference between humans and chimpanzees, who are genetically the closest to humans.
Humans have the Achilles tendon, arch, gluteus maximus, and nuchal ligament, whereas chimpanzees do not.
These parts are all about running, not walking.
It's something that's only seen in specialized animals.
- All quadrupeds other than humans can only take one breath per step because of their body shape and the way they run.
In contrast, humans can breathe independently of the number of steps they take. This is a result of bipedal walking.
Here are the results.
- They have no body hair, are erect, walk on two legs, and have many sweat glands.
They are the only animals that can continue to dissipate heat like an air-cooled engine even in the scorching heat.
That, combined with breathing that is not bound by the number of steps, is what makes all other animals
We have gained characteristics that cannot be replicated.
Its unique feature is that although it is not fast, it can keep running for long periods of time even in the heat.
In addition, they have a characteristic not seen in other animals: cooperation.
By taking advantage of these two characteristics, a group of reptiles can corner a quadruped over time.
It became possible to obtain food, and this is why humans began to walk on two legs...
In fact, the Bushmen of Africa, who are said to be the origin of humankind, have a traditional
Apparently some tribes still continue the style.
However, even in a 42km marathon, many people hurt their legs and hips, and even in a 42km marathon,
Why does running long distances not damage the body at all, but in fact makes you extremely healthy?
There is a modern way of running caused by modern running shoes.
It says there is a reason.
I could go on and on, so I'll stop here. I've never even thought of this until now.
When I come across a book that tells this story, I can experience a truly great intellectual excitement.
However, to conduct this research, I have had to live with the natives for years.
I think the professors at Harvard are really amazing. Scholars are the ones who make profits.
It's not a goal, but seeing how absorbed he is in it shows his scholarly spirit.
I was made to feel that way.