Imagine a sudden rustle in the tall grass. A ripple of alarm passes through the group of early humans who live together amid ancient, rugged terrain. In the center of the encampment, a 3-year-old child – let’s call her Raina – stumbles and falls, her eyes wide with fear. Without hesitation, her mother sweeps her up into her protective arms, while her grandmother quickly gathers herbs and leaves to create a pungent smokescreen to deter lurking predators. Simultaneously, Raina’s father and uncles.