I don't buy into flat earth because: The time it takes to fly from London to New York to Tokyo to London is significantly shorter than the time it takes to fly Dubai to Miami to Hong Kong to Dubai, and that time is longer than the time it takes to fly Sydney to Sao Paolo to Johannesburg to Sydney. This only makes sense if the earth is round and thicker near the equator. If the earth was flat with the north pole in the middle, the Sydney circumnavigation would be the longest, London the shortest. I can't think of any other explanation.