HUNGER: The prime motivator of human behavior and technology. Primitive tools compensate for “puny human” lack of claws, reduced olfactory sense, and other assets possessed by the competition: other hungry animals, including many much smaller than humans, had superior strength, speed, meat-or tough vegetation-tearing teeth (cooking required), protective fur, athletic ability, specialized body parts and instinctive tactics. Early humans HAD TO develop tools!
Our type of brain most likely developed as a “tool” that compensated for (and competed with) the “equipment” of other animals in particular environments. The brain as technology – think about it! LOL