How Early Earth's Unlikely Chemical Hero Appeared

Though it's a toxic chemical, hydrogen cyanide (HCN) is also important for the development of life. It's a precursor to things like amino acids and nucleic acids and plays a central role in theories of the origin of life on Earth. Recently, difficult questions have been asked about how it could have formed on the early Earth. But the authors of new research in PNAS seemed to have figured it out.