Can twins feel each other's pain? Do they share a special bond? Sanjay will attempt to answer these questions by speaking with twin astronauts Mark and Scott Kelly, the research subjects of a fascinating NASA experiment about their own twin relationship. He will also get a more scientific explanation of all that twins share from Dr. Nancy Segal. To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices