Experiments in Mars-like areas in Antarctica could provide clues about how best to search for signs of life on the inhospitable red planet, U.S. scientists said on Wednesday. Scientists from the University of California, San Diego (UCSD) found that mysteriously high salt concentrations in the exposed soils of Antarctica’s Dry Valleys — areas perennially devoid of snow and ice cover — were due to sulfur-emitting marine algae. In a discovery important for Martian exploration, the scientists also found that digging more deeply into the soil of the Dry Valleys yielded higher concentrations of biologically produced sulfates.