As the Mars rovers continue their siesta by the once salty Martian sea, scientists here on Earth are speculating about finding signs of life there. But one scientist is saying not so fast. It appears that, with the exception of the first two Viking spacecraft, the probes and what not we've sent to the red planet were not sterilized. Therefore, any life we find on Mars may be bacteria or other organisms that those ships brought there from Earth. Now we learn this?!?!