Evidence of Martian Liquid Water

[Bear]

I may be naturally pessimistic, but when I did the fermi equation, including rather a bunch of things he didn't include and my own best guesses for some of the probabilities he assumed....

I got approximately 1 in 100 billion. Coincidentally 100 billion is our approximate estimate for the number of stars in this galaxy.

So I figure it's probably about even odds that we're the only ones.