S21E10 — Prenatal Diagnosis / Hearing in Chinchillas

Prenatal Diagnosis: Presents new techniques to examine the fetus while still in the womb to determine its sex and detect possible defects. Hearing in Chinchillas: A look at the similarities between the human ear and the ear of a chinchilla, and a study of how noise can permanently damage hearing in both. Chinchillas are subjected to loud tones and their inner ear membranes are examined for damage in an electron microscope.