Exotic life forms may be lurking in your home, and a new citizen science project seeks to find them. Thermophile microorganisms similar to those that live in the hot springs of Yellowstone were identified in domestic water heaters forty years ago. Now, with support from the NASA Astrobiology Institute, researchers are asking people to sample the hot spring in their own basement. By sampling home water heaters, scientists can learn more about the types of life we may find beyond Earth.