Humans are about 99.9% the same genetic material. The little that makes us different tells fascinating stories about our ancestors and histories, according to geneticist Dr. Janina Jeff. She joins us to share some basics about our genes, and to have a critical conversation about race and facing the harmful history of genetics. Then, New York Times best selling author Mary H.K. Choi helps share the story of a man who built the precursor to our modern day traffic signal. We also get a fun voice message from actor Danny Pudi (Community, Mythic Quest) and his daughter that has us smiling from ear to ear.   See omnystudio.com/listener for privacy information.