Life's first genes may have contained a nucleic acid you've probably never heard of

Life's first genes may have contained a nucleic acid you've probably never heard of: In an effort to trace a pathway from non-evolving organic chemistry to the first truly living cells, scientists from Harvard Medical School in Massachusetts have proposed those early building blocks contained little-known nucleic acids that aren't part of any modern genome.The question of how we evolved genomic libraries encoded in DNA that are managed by protein-based enzymes and transcribed into notes of short-lived lengths of RNA is fundamental to understanding how life arose on Earth.