Life’s ‘last universal common ancestor’ may predate life itself

Researchers have gathered more evidence for the idea that the first spark that spawned us all — the last universal common ancestor (LUCA) — was a part-organic, part-rock chemical system that formed in the energetically and chemically rich environment of hydrothermal vents. New findings also suggest that the two oldest single-celled domains of life, bacteria and archaea, sprang independently from this first source.