Long before Magellan completed the first circumnavigation of the globe, in the 16th century, ancient Greek scientists had demonstrated, by simple observation, that the Earth was round, or rather spherical. Of course, this did not prevent some people from believing that our planet was flat. To be fair, even some individuals don’t believe it now.  See acast.com/privacy for privacy and opt-out information. Learn more about your ad choices. Visit megaphone.fm/adchoices