When On the Origin of Species appeared in 1859, it quickly took hold in the popular imagination—but it also glossed over significant and rather disturbing questions. This program explores Darwin’s ideas on human evolution, which he developed and made public toward the end of his life. Science interpreter Jim Doherty reveals how Darwin searched for parallels between humans and animals through a diverse array of experiments. Beginning by testing the intelligence of earthworms using Darwin’s paper triangle method, Doherty then focuses on the Victorian biologist’s observations of monkeys, apes, and children, as well as his interest in the work of French anatomist Guillaume Duchenne, who studied facial musculature and expressions. Original Open University broadcast title: Of Apes and Men. (58 minutes)