Despite being a cold, arid world, Mars shows signs of liquid water seeping to its surface, according to NASA scientists quoted in news reports. Looking at images snapped by the Mars Global Surveyor spacecraft, researchers have detected evidence of springs on the surface, USAToday reported Wednesday. The discovery could focus on the Valles Marineris region, a gigantic canyon that dominates the planetary landscape, according to NASA Watch, an independent Web site that monitors the space agency.