As you and your MS buddies keep pointing out, Earth life may have been transported to Mars millions of years ago, that would make life there enough like life on Earth to possibly be pathogenic although certainly not the only reason.

Zubrin keeps insisting we have Martian microbes on Earth today and therefore we have all aquired a natural immunity. Where is the scientific evidence for this? Martian organisms would have a slightly different circadian rhythm if this was true but would be detectable.

Hey Mark, is Richard Hoagland going to be making a presentation to the Mars Society Conference next year or is the last one?

BarryD