WASHINGTON, D.C. – Scientists have observed the presence of single-celled organisms in Mexico, inviting speculation that the arid wasteland may have sustained life at some point in the past, and could possibly be colonized in the future. Scientists were quick to caution against unbridled enthusiasm, noting that while thermal imaging has identified possible sources of water just under the surface, probe results have indicated that the soil is an estimated 40% benzoylmethylecgonine (cocaine) and 30% concentrated lead. The new discovery