This quick TED talk entry is courtesy of TED.com. While we like to imagine little green men, itâ€™s far more likely that life on other planets will be microbial. Planetary scientist Nathalie Cabrol takes us inside the search for microbes on Mars, a hunt which counterintuitively leads us to the remote lakes of the Andes mountains. This extreme environment â€” with its thin atmosphere and scorched land â€” approximates the surface of Mars about 3.5 billion years ago. How microbes adapt to survive here may just show us where to look on Mars â€” and could help us understand why some microbial pathways lead to civilization while others are a dead end.