Raoul wrote: That's why sending a crew to Mars , land, and return back is going to be much more difficult than the Mars Society suggests.

Chris writes: I'm sorry must have dozed off listening to Scott's cock and bull story telling...where do members of the Mars Society say going to Mars would be easy?

In his talk Scott chooses to give us the least favorable methods to achieve a goal. Who thinks it is honest to do so? Going to Mars you travel as quickly as possible (shortest time to Mars), you bring tools for repair and you plan differently than you do for short trips like Apollo, get a clue.