Boris Johnson has been ticked off for misleading Parliament on jobs and on crime. He claimed that the number of people in employment has been rising - when it's been falling. And he made a claim that crime has fallen - when it's risen. Tim Harford and guests discuss the truth, and what Parliament can do to defend it. Plus, an examination of the rules around testosterone and trans women's participation in elite sport, and the spirit of Donald Rumsfeld helps navigate the largely unknown world of fungi
