Methane on Mars

Maybe Marvin the Martian is a cow.
NASA held a press conference today to announce that data from orbiting spacecraft picked shows plumes of methane on Mars. Not just a singular event, but various plume events over the last 5 years.
Before you go and get all ALH 84001-style excited about life on Mars, please remember that methane can be produced both biologically and geologically. For example, both bovine digestive processes and volcanic processes create methane on Earth. No one is sure where the methane on Mars is coming from. However, the fact that plumes have been seen over this extended period of time leads planetary geologists to think there is some sort of active process on Mars they had not considered before.
So the long and the short of the story is that there is no direct evidence of life on Mars, no matter what the crazies tell you. Instead, just another answer that just leads to more questions. Oh, how I love science!

Follow this link to a video from NASA about these results.