Everyone stands and grabs his hunting bow. Onwas is an old man, perhaps over 60—years are not a unit of time he uses—but thin and fit in the Hadza way. He's maybe five feet tall. Across his ...

The Hadza are one of the last remaining hunter-gatherer tribes in the world. It's thought they've lived on the same land in northern Tanzania, eating berries, tubers and 30 different mammals for ...