What’s the science behind bullying?

Tai and his friends all have experiences of being bullied. And, as he learns, it’s a pretty universal thing - even trees are known to bully other trees! Why is such an unpleasant thing so widespread? What is the science behind bullying? For transcripts of this series, please visit: https://www.cbc.ca/radio/podcastnews/tai-asks-why-transcripts-listen-1.6747759