Trapped inside massive crystals deep in a Mexican cave, creatures have been discovered that subsist on iron, sulfur, and other chemicals. The researchers say the microbial lifeforms are new to science, but have been tucked away for tens of thousands of years. Should the discovery be verified, it will add to evidence that "microbial life on Earth can endure harsher conditions in isolated places than scientists previously thought possible." "These organisms have been dormant but viable for geologically significant periods of time, and they can be released due to other geological processes," explains NASA Astrobiology Institute director Penelope Boston."This has profound effects on how we try to understand the evolutionary history of microbial life on this planet." However, such a discovery does raise concerns about our search for life beyond this planet, despite the rigorous sterilization spacecraft undergo before a mission. "How do we ensure that life-detection missions are going to