SPACE - Here's why everybody is freaking out about methane on Mars

After almost a year of searching, NASA's Curiosity rover has turned up no traces of the four-pronged hydrocarbon known as methane. This special molecule is regarded by many as a chemical signature of past or present life on the red planet. That means there's no life on Mars, right? Wrong.Read more.. ...

http://io9.com/heres-why-everybody-is-freaking-out-about-methane-on-m-