At first people were like wild animals.He had to protect himself to live.Started to throw stones at harmful animals,then used long and sharp stones.People are using their brain.The break and sift the stones,he was protecting himself from harmful animals.
They made their firs invention,because they were afraid of harmful animals.Live in trees to be protected and they were eating tree leaves.It goes down when there is no danger.They were hunting small animals there.Harmful animals were fleening from attack.Using his brain,they are setting up a new life there.When the food is there it goes elsewhere.
Races emerged as a result of a such migrations.People change according to where they live.
Human brain has evolved over time and continues to evolve...
