Are group boundaries solid, impermeable, and red in tooth-and-claw? Is animosity between groups inevitable? In this episode, we talk to Anne Pisor ( Penn State) about all things inter-group from an evolutionary perspective, including the forging of relationships across group boundaries as a way to deal with uncertainty and risk, and the circumstances that increase or decrease inter-group antagonism. 

More about Anne Pisor:

https://anth.la.psu.edu/people/anne-pisor/

https://scholar.google.com/citations?user=Qav4JJ4AAAAJ&hl=en