New research challenges long-held assumptions about amino acid evolution — and could reshape the search for life beyond Earth.
The Building Blocks Were There Before Life Was
For decades, scientists believed they had a reasonably firm grasp on the sequence of events that gave rise to life on Earth — a tidy origin story involving…
Every person with blue eyes is genetically linked to a single prehistoric individual — and science has the receipts.
The Mutation That Changed Everything
Brown eyes once ruled the world. For most of human prehistory, high concentrations of melanin — the pigment that determines the color of skin, hair, and eyes — kept the global…

