…Kalambo Falls in eastern Africa, sites dating to more than two hundred thousand years ago) has proven to be a more effective forager than its predecessor, with the ability to kill even large animals with fire-hardened wooden spears.

According to conventional theory, these archaic humans, who settled in all parts of Africa, evolved gradually toward modern forms, their skulls becoming more rounded, skeletons less robust, and molar teeth smaller.

H. ergaster is thought to be the first hominin to vocalize.

As H. heidelbergensis developed, more sophisticated culture proceeded from this point.