Stuart Clark: It’s so clearly obvious that the world isn’t flat. We see when ships leave the harbour you can see as they gradually disappear below the horizon. You can see if you go up on top ...

Ever wondered why Earth looks flat even though it's a sphere? The planet's massive size makes its curvature nearly impossible ...

The flat-Earthers sure have a great imagination. But what if they were right? How would the Earth hold up in space? Would it ...