Elon Musk is the co-founder of PayPal, SpaceX, Tesla, and SolarCity. He is through-and-through an entrepreneur with a technical mind and "scientific ambition" — by scientific ambition I mean those that dream of things that don't exist. People like Elon Musk are the ones that can have a big impact on society.

Those interested in science, particularly clean energy and space, or entrepreneurship will like the following video. The video is Elon Musk's answers to questions posed by reddit.