Maybe Beano would help

Methane gas may reveal signs of life on Mars according to this MSNBC report based on what two NASA researchers say is "strong evidence."

The two scientists, according to sources at the Sunday meeting, based their case in part on Mars’ fluctuating methane signatures that could be a sign of an active underground biosphere and nearby surface concentrations of the sulfate jarosite, a mineral salt found on Earth in hot springs and other acidic bodies of water like Rio Tinto that have been found to harbor life despite their inhospitable environments.