Alan Burdick: “The unsettling thing about spending two days at a convention of people who believe that Earth is flat isn’t the possibility that you, too, might come to accept their world view, although I did worry a little about that. Rather, it’s the very real likelihood that, after sitting through hours of presentations on ‘scientism,’ lightning angels, and nasa’s many conspiracies — the moon-landing hoax, the International Fake Station, so-called satellites — and in chatting with I.T.