Key to life on Mars lies in the soil News Unlimited

Evidence for life on Mars might be in the soil – and overlooked because all previous missions had the wrong detector system. Organic chemicals such as alcohol, vinegar or oxalic acid – the stuff that makes rhubarb leaves taste bitter – might have existed on Mars, but landing craft would have failed to detect their byproducts. The harsh, thin Martian atmosphere would have altered such life-associated chemicals in various ways.