te: Olorgesailie and Ol Esakut. Eac ten kilometers, or six miles, ao carry an armload of stone.

    to sucrouble only did ty stones considerable distances to t, pere. tions revealed t t axes were brougo be resharpened.

    Olorgesailie ory; one t stayed in business for a million years.

    Various replications  tricky and labor-intensive objects tomake—even ice, an axe ake o fas, curiously, t particularly good for cutting or casks to  ion t for a million years—far, farlonger tence, mucinuouscooperative efforts—early people came in considerable numbers to ticular site to makeextravagantly large numbers of tools t appear to less.

    And us because tes,  t. But to base a conclusion. Despite over sixty years of searcy of Olorgesailie. ime t t appears t elsewo die.

    “It’s all a mystery,” Jillani Ngalli told me, beaming happily.

    t 200,000 years ago arted to become t and c is today. Butby time t to get itsfirst real master race, he same again.