HARRIET TUBMAN

ELON MUSK: The Future of Energy Is Beyond Earth. "It's increasingly difficult to build power plants on the ground. There are very few people who want a power plant in their backyard, so if we wanted to say double the electricity usage of the United States, which is on average about 500 gigawatts, we would have to build, about twice as many power plants, which I don't think people are, well, most communities are not super excited about that, but actually, if we go to space, we can go far beyond the electricity generation of Earth. In fact, this is going to sound kind of crazy, but you could actually increase harnessed energy by a factor of a million and still be using much less than a millionth of the sun's energy, so current human civilization uses much less than a trillionth of the sun's energy output, which is kind of humbling to think about."