Us and Them: Are We Biologically Primed to Fear Outsiders?

Are we biologically primed to fear outsiders? And can science help us bridge the divide when conflicts arise?
Last year, an estimated 65.3 million people were displaced from their homes and forced to seek refuge. In many of their new home countries they are unwanted outsiders. Ian Sample is joined in the studio by social psychologist Professor Miles Hewstone and primatologist Dr Kit Opie to discuss group behaviour and the divisions that define us as human.

The Guardian’s Science Weekly | 22nd July 2016