Layer by layer, life evolved peacefully in its course. Then came humans. The first humans were more like apes. They ate what they found on the ground or in the trees, and they hunted what they could. They cooperated, but they acted purely on instinct. But humans are not like other animals. They discovered that to increase their chances of survival, they should focus on developing their intellect rather than their bodies. As a result, they learned how to make weapons for hunting, instead of using their hands or rocks. They also learned how to use vessels for gathering and storing food. Over time, humans improved the use of their intellect, which enhanced their chances of survival even more. Thus, gradually, the human race became ruler of the earth...