"Follow the water" has been a guiding mantra of astrobiology, and even space exploration more generally, for decades. If you want to find life, it makes sense to look for the universal solvent that almost all types of life on Earth use. But what if life doesn't actually need water to live or even evolve? A recent paper, available on the preprint server arXiv by researchers at MIT, including Dr. Sara Seager, and the University of Cardiff, proposes an alternative to water as the basis for life—ionic liquids (ILs) and deep eutectic solvents (DES).
