Scientists show that microbes from Earth can survive conditions found…

Astrobiologists have been worried for quite some time now that the Martian surface has been contaminated with microbes originating from Earth — what got there by clinging to all the various probes and artifacts we've sent there. But given how severe the conditions are on Mars, it has been generally assumed that this… » 12/26/12 9:00am 12/26/12 9:00am