Mark Dolan came into Channel 4 to talk about his experiences filming the second series of The World's...
In this series, Mark and the team are looking at how people made unusual lifestyle choices, rather than those who are born physically different.
In the first show Mark tracks down some of the cleverest children in the world. Kate Quilton asked him how he felt about meeting these very special kids from his point of view as a father. Watch the interview here.
Mark also visited some of the largest families in the world. This included a meeting with Mr Daad, father to one of the biggest. Watch what Mark thought about the chances of his wife having such a large family!
