https://www.theregister.co.uk/2018/06/08/nasa_finds_more_stuff_suggesting_mars_could_have_hosted_life_maybe/

NASA’s Curiosity rover has again found evidence that Mars was potentially capable of hosting life.

As detailed in a new Science paper, “Organic matter preserved in 3-billion-year-old mudstones at Gale crater, Mars”, some of the soil samples Curiosity took from the bottom of Gale Crater turned up molecules of “thiophenes, benzene, toluene, and small carbon chains, such as propane or butene.”