The Diecast Zone · Model Car Club Since 1994
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Being the skeptic that I am...
...the statement that "NASA announced Wednesday that a primitive form of microscopic life may have existed on Mars about 4 billion years ago."... is enough to cause more doubt & suspicion than it does proof.
The word "may" (in & of itself) only "indicates the possibility or probability" of something - this (again) is not proof of life. "May" is just like "if" - two of the "biggest words in the English language" that too easily lend themselves to nebulosity.
As Marlowe said in his post (#26772.3.1.3.1), your source eve admitted "...that although compelling, the final analysis of life was inconclusive..."
So, we're back to square one - 0.00% proof.
LOL, so when he made that announcement you didn't really believe it then and subsequently were more than happy to go with ANY scientist who expressed ANY doubts.
In any case, as I said before although you can't actually "prove" anything (and you certainly can't prove that something _doesn't_ exist) there is plenty of solid evidence that life is extant beyond that found presently on Earth. It's a shame you haven't actually examined the research, the literature and the evidence for yourself.