Who gave us an encyclopedia in our pockets? Why is the statement that Donald Trump is the "worst president in US history" allowed on his Wikipedia page? How do Brazilians and Americans differ on the history of the airplane? Rory Stewart and Alastair Campbell are joined by the creator of Wikipedia, Jimmy Wales, to discuss all this and more. Social Producer: Celine Charles Video Editor: Adam Thornton Assistant Producer: Daisy Alston-Horne Producer: Alice Horrell Senior Producer: Nicole Maslen Head of Politics: Tom Whiter