Scientists such as anthropologists divide hominids into three different types based on their body shapes and lifestyles. The first type of hominids are referred to as Homo habilis, which means ‘person with abilities.' It is believed that Homo habilis lived until about 1.5 million years ago.
The second type of early human living on the Earth was Homo erectus, which means ‘person who walks upright.' Homo erectus lived on the Earth until about 150,000 years ago.
The final type of hominid living on the Earth is Homo sapien. Homo sapien means ‘person who can think’. All humans living on the Earth today are Homo sapiens.
Men go abroad to wonder at the heights of mountains, at the huge waves of the sea, at the long courses of the rivers, at the vast compass of the ocean, at the circular motions of the stars; and they pass by themselves without wondering.
Slaves in Ancient Rome made up to 40% of the population.