Let us stand up and spread both our hands full and wide. Assume that width indicates the history of the earth. What will indicate the length of human history? One arm length? Up to an elbow? Or the length of our palm? Maybe the length of a finger! Your guess is nowhere near the truth. You will have to see that under a microscope!
Though humans have been around for such a short time, they have achieved a lot. How has this been possible? No other species comes anywhere near humans in achievements; we will understand more about humans if we look at history more in detail. The first humans appeared about 2.5 million years ago in East Africa. The migration has started from those times, and the first migrants ended up in Europe.
Homo Sapiens, the first modern humans, appeared 300000 years ago. They were nothing special. They walked erect, had a larger brain, used tools and were highly social. But other human species also did these things like lighting fire and killing big game for food. Despite so many similarities, homo sapiens survived and went from strength to strength; other humans simply withered. Why is that so? Two theories led to homo sapiens overcoming all odds, and different human races went to extinction. The theory of interbreeding (between homo sapiens and others) is proven as modern humans show the DNA of different races other than their predominant DNA.
Another theory is the replacement theory. According to this theory, Homo Sapiens overcame other races and took away their food resources because of their superior brains. When required, they violently killed people from different races. This indicates that the Homo Sapiens led the other species to destruction, and at the same time, interbred with them to produce progeny.
About seventy thousand years ago, there was a sudden improvement in Homo Sapiens’ brain. Homo Sapiens took advantage of the same and started creating larger communities. They also started making more extensive tools, formed business networks to handle business more efficiently. This evolution in the brain is known as the cognitive revolution.
This evolution helped the homo sapiens find food and manage the harshest environment easier than other human species. Homo Sapiens reached America through the arctic cold of the Alaska region. To handle the extreme cold, they learned to kill the enormous nutrient-filled animals, made snowshoes and warm clothing out of their skin and fur to survive the bitter cold.
The revolution of brainpower helped homo sapiens to spread right across the globe to Europe and even to Australia with primitive modes of transport. This had another effect. Fifty thousand years ago, Australia had twenty feet long animals. These quickly raced to extinction after the superior Homo Sapiens reached Australia.
What is the most critical indicator of development in Homo Sapiens that indicates brainpower improvement? To me, the most important in the list would be human language. Language is one of the most complicated means of communication compared to other species. Other species use a very primitive method of communication.
Homo Sapiens are social animals. They can communicate by using language and sharing information about food, shelter, weather, and harmful elements from society. If an abundant supply of fruits was found, this information could be shared with the community. If a hiding place of a predator was known, all could be told to avoid going to that area. Common knowledge of many different aspects of life helped them to live peacefully.
Other species also work cooperatively, e. g. bees. Bees collect honey in the beehive, but their cooperation is very rigid. If there is a danger to the bees and beehives, they cannot communicate; they do not run away from the area. Chimpanzees work in groups, but with language barriers can share only to a certain extent.
Homo Sapiens were the only groups that could communicate with each other using language. This helped them speak about material things and abstract things like god, religion, history, and rights. This brought a more extensive community together, even though many may not know each other personally. This aspect gave rise to myths that were not physical, for example, religion! Societal bonding became closer with faith.
Early Homo Sapiens was, on average, a group of about 150 people. But with language came other improvements and developments. That led to the formation of villages, towns, cities, megacities, states and nations. In short, it led to the creation of the modern world as we know it. Finally, the technologies like the Internet has helped in the creation of global societies.
Another significant change that took place was agriculture. Ten thousand years ago, homo sapiens slowly started settling down to become farmers. Compared to hunting/gathering, farming was inefficient and depended on the vagaries of nature. By the time humans realised the downsides of agriculture, it was too late to switch back to hunter/gatherer mode. All became used to a quiet life of not looking for food/shelter all the time. Another improvement was that near own homes, abundant different variety of food became readily available. With that, it was easy to feed more people, families grew larger! Before this development, if you did not have food, you asked your neighbour for food. He would give you the same with the knowledge that you would do the same when needed. But with the abundance of everything, the barter system started where you exchanged stuff with each other. Simultaneously, with a stable lifestyle, different trades began, like making farm tools, knives, etc. But this could be done because there was stability in life. Soon the deficiencies of the barter system were realised. What did you do if you did not need a knife or a shovel? That is where currency and writing started to develop. This happened around the year 3000 BC.
The trade details were noted down on stone tablets, and a pig farmer was paid in currency. The currency was then used to purchase whatever else they wanted to buy. How to handle these complex transactions without disputes? The hierarchical system of King, his deputies, and then people ran administration right up to village level. That, my friends, was the beginning of the modern world.
Today we assume so many things, but we do not realise that the journey in this direction had begun slowly a few thousand years ago. Now improvement in systems happen almost yearly, monthly or even daily. But I am pretty sure that the human brain is large enough to absorb these changes elegantly!