Re: Hmmmn.. pizza!
Talking of towers, I don't see the point of sending an empty ship back from Mars to Earth. They would be very useful as 'starter homes' on Mars, and/or would give the new residents a way to leave Mars if everything went tits-up there - after all the odds of an asteroid hitting our backup facility is just as great as it hitting our primary.
Biting the hand that feeds IT
