Nice, I think I've heard his reasoning before on this subject. However thanks for this clip as I don't think I've seen it before. I have skimmed it and bookmarked it for when I have time to watch.
Initially I like the economic reasons he is giving for space exploration, kind of where I'm at at the moment so good to hear other theories.
Thanks!
Yeah, not to mention there is much less gravity on Mars. Venus would be better if we could alter the atmosphere.