Modern myth.
http://en.wikipedia.org/wiki/Myth_of_the_Flat_Earth
http://science.howstuffworks.com/sci....htm/printable
In any case, if you want to reject the concept of science and certainty in the modern age, by all means, do us all a favor and stop using your computer and electricity it needs, and availing yourself of modern medicine. Or was it religion that created those?