Homo Sapiens and the Industrial Revolutions

How did we come to live in a world where so many human beings are packed into these cities, all across the globe? How did we create these wondrous buildings our ancestors could have never dreamed of? We take the modern world for granted, but we shouldn't. Homo sapiens have existed for about 200,000 years, and 94% of that time we were hunter-gatherers. The Industrial Revolutions begins long before the 18th century with chapter 5.