Hear from filmmakers Tim Wardle and Becky read about the process of investigating the compelling story behind Three Identical Strangers in a special bonus episode.

Sanjay dives into the fraught history of domestic adoption in the United States. First, he'll speak with adoption historian Dr. E. Wayne Carp to get some context and hear about the role that secrecy has played in American adoption practices. Then, writer Rene Denfeld shares her heartwarming story...

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...