Gas 'may be sign of life' on Mars

What happen in the story?
The story say about that maybe there was gas on the Mars.
When did the story happen?
It happen on January 16.
I don't thinks that happen in Mars
But who know if there's gas or somethings on Mars
http://news.bbc.co.uk/cbbcnews/hi/newsid_7830000/newsid_7834200/7834258.stm