Let’s be honest. Black lives haven’t always mattered to some unscrupulous medical researchers.

So any discussion of vaccine hesitancy has to acknowledge those doubts;  we talk about the Kano incident. We’ll find out from a Nigerian journalist who covered the tragedy exactly what happened, and why some people still don’t trust big drug companies.

And we look at anti-vax history.  How did a trend amongst conservative clergymen in 18th Century England develop into a worldwide anti-Western, anti-establishment movement? How is a fraudulent former doctor from Eton involved in the story? And what's the Hollywood connection?