Terror cells: have our prisons become finishing schools for extremists?

In the aftermath of the Streatham attack, we take a look at how our prisons became finishing schools for extremists (00:40). Plus, what on earth happened in the Iowa caucus (11:25)? And last, is there anything true in the stories about Calamity Jane (22:50)?

With James Forsyth, Haras Rafiq, Freddy Gray, Karin Robinson, and Karen R Jones.

Presented by Lara Prendergast and Cindy Yu.

Produced by Cindy Yu and Gus Carter.