[RightWhale]

The atmosphere is so light that man could jump from one floor to another without the use of stairs.

When I was young I could leap 24". On Mars that would have been 63", which is 5 feet. Floors are usually at least 8 feet apart, sometimes 10 or 12 feet. Anyway, it's usually considered gravity rather than the weight of the atmosphere that determines how high one might leap.

[MissAmericanPie]

Don't argue with me, I'm looking at my science degree right here on the back of this here cereal box. All I gotta do is fill in ma name.=o)

Gravity of course, I should have known that, I have years worth of scars, due to lacking the grace of a ballerina, to remind me.