Not until the 18th century that it was considered to be knowledge that the earth was indeed flat. This so called knowledge was questioned by people with theories and those theories were proven to be true. Does that mean that the earth being flat was never knowledge since proven to be untrue? Can something be considered knowledge if there is no evidence to support the theory? How is it evidence can be found for something that is untrue or not proven to be true? How can it be called ‘knowledge’ then, surely it remains a theory, which comes from imagination.