I gave another talk was today here at Johnson Space Center, on the latest evidence for life on Mars. I've had the honour of working with the scientists who in 1996 discovered life signs on meteorite ALH84001. The presentation was originally given at the Scientific Committee for Antarctic Research (SCAR) conference in Buenos Aires. Like a changing speed of light, the discovery of life signs on a Martian meteorite has fought an uphill battle. Today evidence shows what many have long believed, that life exists on another world.