Here is a link to a youtube channel that has the video from Horizon: Are you good or evil.
You need to watch this video in your own time (it will be set as a homework) in preparation for completing the evidence of practice.
The documentary is in 6 parts and you will need to watch all of them.
Here is an article on Oxytocin from Ed Yong looking at the bias in Paul Zak’s research.
Here is Ed Yong’s twitter rant about it.