Manganese dioxide can convert amino acids into hydrogen cyanide (HCN) without requiring methane, a finding that solves a long-standing puzzle about the origin of this key prebiotic molecule on early Earth. Although HCN is central to origin-of-life theories, recent evidence suggests early Earth's atm osphere didn't contain sufficient methane needed for classic HCN-producing reactions. The newly found chemical pathway, reported by researchers from Science Tokyo, shows that HCN could instead have been continuously supplied from abundant amino acids. ...read more read less