Who are flat-Earthers?

Correct answer is people who believe that Earth is not ellipsoid as the science proved, but flat.

Explanation:

This theory dominated in Ancient period, even in Middle Ages, when this theory was supported even by the church. On the other side, even in the period of Ancient Greece Eratosthenes realized that the Earth is not flat, but it was until 16th Century when scientist started supporting it furthermore. Magellan's journey and the works of Copernicus and Galilei helped the spreading of scientific results.

Still, there are some people who don't believe that Earth is ellipsoid, but flat.