Some people still believe the earth is flat

"Flat earth theory is still around. On the internet and in small meeting rooms in Britain and the US, flat earth believers get together to challenge the "conspiracy" that the Earth is round...

What about all the photos from space that show, beyond a shadow of doubt, that the Earth is round? "The space agencies of the world are involved in an international conspiracy to dupe the public for vast profit," says Mr McIntyre.

And what about the fact that no one has ever fallen off the edge of our supposedly disc-shaped world?

Mr McIntyre laughs. "This is perhaps one of the most commonly asked questions," he says. "A cursory examination of a flat earth map fairly well explains the reason - the North Pole is central, and Antarctica comprises the entire circumference of the Earth. Circumnavigation is a case of travelling in a very broad circle across the surface of the Earth."

In fact, people have known since at least the 4th century BC that the earth is round, and the pseudo-scientific conviction that we actually live on a disc didn't emerge until Victorian times.

Theories about the earth being flat really came to the fore in 19th Century England. With the rise and rise of scientific rationalism, which seemed to undermine Biblical authority, some Christian thinkers decided to launch an attack on established science.