In this episode of Talk Nerdy, Cara is joined by Dr. Barbara Rae-Venter to talk about her new book, "I Know Who You Are: How an Amateur DNA Sleuth Unmasked the Golden State Killer and Changed Crime Fighting Forever." They discuss the fascinating science of investigative genetic genealogy, including how the Golden State Killer was caught after 44 years.

This episode of Talk Nerdy is sponsored by Blackstone Publishing. Order the new book, "There Are (No) Stupid Questions...in Science" today!