Why do some people believe the Earth is flat?

If you type ‘flat Earth’ into Google, you’d be joining a group of people that have helped to triple the search term over the last couple of years. In fact, a recent YouGov poll found that only around two-thirds of Americans aged between 18 and 24 believe that the Earth is round.

Although the idea the Earth is flat has been scientifically discredited, there seems to be a growing belief in the conspiracy theory.