Imagination gives ability to design

The first stone tools were made by HUMANS because Stone Tools can only be made based on imagination and design . Having the ability to Imagine and design depends on having language and culture , or symbol communication and behavior. So the makers of the first Stone tools ,HOMO HABILIS , had language and culture . Having language and culture is the definition of being human ; no other animal species has it ; not even chimps or gorillas , our closet living species .

Anthropology's special contribution to scientific understanding of humanity is the concept of _culture_, or the symbolic nature of human communication and social organization v. Culture is behavior ruled by a mental system of shared customs, traditions, values, ideas and material products of a particular group of people. Culture and language , or symbolic communication , are unique and exclusive characteristics of human beings, the species Homo sapiens . No other animal species has them, despite the exaggerated claims of some primatologists for chimps and gorillas.

Culture and language provided the human species with an enormous adaptive and Darwinian selective advantage in the tens of thousands of years that the human species came to be and inhabit the whole globe, again to a greater extent than any other phylum Chordata species. This is because it made humans extremely socially interconnected both with living other humans so that human labor and methods of physical survival are very _social_, not individualistic; and perhaps more importantly, socially connected to dead generations of the species through , again, language and culture, as in ancestor veneration , myths, legends, stories, customs, historical accounts of past generations' experiences. Two heads are better than one in the struggles for survival and snuggles for reproduction. By sharing the experiences , discoveries, knowledge of many generations past and those of fellow living people, humans had and have a big Darwinian or natural selective advantage especially in the stone age in prehistoric times over the course of 100's of thousands of years and starting going back 2.5 million of years with the species Homo habilis .

Homo habilis is the first human species because is the first species _ever_ to have language and culture or _ symbolic_ thinking . We know this because only with symbolic thinking cam tools be made based on a design , a pattern , with imagination.