von Michael Klein
Für die Wikipedia ist die Sache klar:

“Modern flat Earth societies are organizations that promote the belief that the Earth is flat rather than a globe. Such groups date from the middle of the 20th century; some adherents are serious and some are not. Those who are serious are often motivated by pseudoscience or conspiracy theories.”

Diejenigen, die behaupten, die Erde sei eine Scheibe, sind Spinner, die von Pseudo-Wissenschaft getrieben sind und Verschwörungstheorien anhängen.