http://www.ted.com So the Mars Rovers didn't scoop up any alien lifeforms. Scientist Penelope 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. source

During a visit to Perimeter Institute to deliver a sold-out public lecture, Dr. Penelope Boston sat down to explain why she explores caves, what cave life might tell us about life elsewhere in the universe, and how it feels to emerge after five days in a toxic underground world. Dr. Boston is ...