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Life on Mars?

"Penelope Boston studies caves and karst formations, and the special biology that lives in them -- both here on Earth and possibly on other planets...So the Mars Rovers didn't scoop up any alien lifeforms. Dr. Boston thinks there's a good chance -- a 25 to 50 percent chance, in fact -- that life might exist on Mars, deep inside the planet's caves. She details how we should look and why." Read more about Dr. Boston at this link.