Credit: AP Photo / Hans-Maximo Musielik

First: We ask Georgetown history professor Katherine Benton-Cohen how America transformed from a country with open borders to one - by the 1920s - with a strict quota system.

Next: Pediatrician Nadine Burke Harris explains how childhood trauma can permanently impact children’s mental and physical health.  

Then: Thomas Jefferson had two identities: the founding father who wrote “all men are created equal” and a slaveholder. We investigate how human rights have evolved since before his time— and how we still have a long way to go.