The world is enormous. Really huge. In fact, by 2050, scientists predicted that there would be about 20 to 30 billion people. Now, people live in cities, and about 20% live in rural and undeveloped areas. Such so, people decided to step up from stilt homes to skyscrapers. But, there's a time where all of these people, in theory, could fit in an entire city. What city is that? We'll cover that in this episode.