After a year roaming the surface of Mars, NASA has failed to find any evidence that its atmosphere is supporting life, it was revealed today. The Curiosity rover currently scanning the Red Planet has not detected any methane, a gas that is produced by living things. Since landing in Gale Crater last year, every morning and evening the car-size probe has analyzed Mars’ air and scanned it with a tiny laser in search of the greenhouse gas. Not finding it means that it is unlikely that microbes capable of producing the gas are living below the planet’s surface, scientists said...