Take, for example, a person has named was Adam meet a girl who has named Eva. They did something with an apple and the humans have been creating.

For the first time have alive, humans have just basic people. Due to having a developing brain so the human more discovers the Earth than in past time. Working hard for many other situations to have the opportunity to take the bread.

Starting to appear tool from other of the material have been born rich human and poor human.

Rich humans have power in all.

And anywhere develop is always grow some king of the land alive.In the world, King's children become the King again.

Poor human is the main component that provides everything for King or rich human. Step by step, all bio alive the earth has a role for each other.

Not only human but also a dog have a role.

Dog of rich human seems to more expensive than a life of poor human. The death of the rich dog breaks the heart of a rich human while a poor human has not anything for food to alive.

Therefore, the level of human depends on their brain and the lucky which god give it.

We can't change the past cause it was passing for an extremely long time. But your brain will improve slowly if your hard work and use all power of that in the future.