Space fans, scientists, those among you who've read the book and/or have an opinion on the matter... I pose you these questions:
-What are the weaknesses in Zubrin's arguments?
-What other/better plans are in the works?
-Is there any (financial) profit likely to be made by sending people to Mars? I know that there is purportedly Deuterium in large quantities, but is it worth the costs of mining it & shipping it back to Earth?
-Would you go (for a 2 year or more on-planet mission, plus travel time)?
-What is the freaking hold up in getting a human mission to Mars started?