[extra credit] D) Science & Futurism with Isaac Arthur (Can we have a Trillion People on Earth?)
1) What was surprising or interesting in the video? 1 trillion is 100 times the current population and about 10 times the total number of people who have ever existed in human history. Earth's surface area is approximately 500 million square kilometers or 200 million square miles, with about a quarter of that being land. If we were to pave every area from the deepest oceans to frozen tundras, assuming a total population of 1 trillion, the population density would be only 2,000 people per square kilometer or 5,000 people per square mile. While not a small number, this is lower than the density of even the most densely populated cities in the world. If people were to live only on land excluding the sea and without multi-story buildings, each individual or average family could secure a spacious area of 1,400 square feet per person. As a child, the population of China felt truly overwhelming. The legend of the "human wave" conjured images of endless waves of zombies. Howe...