Viviane Callier writes in Quanta: When Charles Darwin articulated his theory of evolution by natural selection in On the Origin of Species in 1859, he focused on adaptations — the changes that enable organisms to survive in new or changing environments. Selection for favorable adaptations, he suggested, allowed ancient ancestral forms to gradually diversify into countless species. […]

via Uh-oh: Theorists Debate How ‘Neutral’ Evolution Really Is — Later On