(NOTE: Statements in this talk have been challenged by scientists working in this field. Read "Corrections & Updates" below for more details.) Elaine Morgan was a tenacious proponent of a theory that is not widely accepted. The aquatic ape hypothesis lays out the idea that humans evolved from primate ancestors who dwelt in watery habitats. Hear her spirited defense of the idea -- and her theory on why science doesn't take it seriously.