You may not know much about Elon Musk. Or maybe you do. This video, an interview with Elon last week on TED, provides a simple reason as to why he does what he does.
What I found so engaging and profound was his reason for doing what he does, and why he pushes himself so much. If your imagination could do with a stretch, and the innovations of Elon hold some interest for you, do yourself a favour and watch this video.