Now how did we do this? How did we go from being hunter-gatherers 10,000 years ago to building these gigantic cities in just a few thousand years?
我们是怎样达到这样的成就呢？ 我们是怎样从10,000年前的狩猎者和采集者， 就在仅仅几千年后变成修建这些庞大建筑的人了呢？