Flat earth theory has became a big thing lately. What shocked me was there are nearly 40% of the people believe in this theory. Well, at least from voters on some YouTube videos. For example, there is a FlatEarth theory debunked video which I think it explains quite clearly and full of facts. It earned 8000 likes for the video, but at the same time, it received 6000 dislikes. I thought the video is as clear as it can be stating the facts. There shouldn't be any arguments after watching it. But how wrong I was. And the people who disliked the Video was full of hate. A lot of the comments were hateful attacks. Well I'm not going to sit here and let this be. I actually went to see one of the proofs myself. I went to Niagara-on-the-Lake. I looked across Lake Ontario to see downtown Toronto. Bingo, the city appeared behind the horizon very clearly. I can only see 70% of the CN Tower. The distance is over 30 kilometers and you need tall buildings to show such effect. Flat Earther claim objects are always in front of the horizon and I proved them wrong.