The world is flat.

This is acceptable. I will now demonstrate that his arguments are not adequate in demonstrating the flat nature of the Earth. He first claim is that (komodo) dragons do exist in the status quo and that they may be to blame for the sinking ship phenomenon I mentioned earlier as part of my "round earth" argument. First, we must realize that there are a total of about 4,500 komodos left. [1] Then we must realize that are over 80,000 commercial ships currently in service, discounting military vessels and private vessels. [2] If, for some reason, komodo dragons did possess this intense thirst for human blood, it woudn't much matter -- as there simply are not enough komodo dragons to account for the sinking of these vessels. Additionally, this argument largely ignores the fact that many of these vessels end up returning home after their voyage. (As a reminder, my original argument was regarding how ships appear to "sink into the horizon" when leaving port as a direct result of the roundness of the earth. ) It is clear komodos cannot be responsible. (Nevermind the fact that komodo dragons simply do not have the jaw strength to tear through a wooden hull, much less a steel hull. ) -------Next, the opponent refers to the dragons that are part of many cultures then concludes that they could be real. While I don't deny it's technically possible that they are real, living in some forest on some secluded island, the lack of evidence for them does not justify our belief in them. Let's remember that many cultures have mythological entities as part of their belief system, but this does not mean they are real. Religion is an excellent example. While we may be tempted to believe at least one religion is correct, we know that multiple ones cannot be correct simultaneously. This means a large wealth of cultures belief in a mythical creature that simply does not exist, destroying the idea that if something is supported by cultural mythology, it must be real. -----------Lastly, the opponent seeks to show that aliens exist, therefore it's possible that they could be messing with us. I first want to point out that his source is completely intellectually dishonest. No good scientist in his right mind would claim that something exists with 100% certainty without said thing already having been documented as existent. Beyond that, I don't deny that aliens probably exist. However, the gap between "probably existing somewhere" and "messing with our heads" is one so wide that it cannot be considered without significant evidence -- evidence that has not been presented. The opponent has not given us any reason to suppose that aliens are messing with our heads. Alternatively, I have presented evidence (that has not been refuted), that pretty clearly explains the apparent roundness as being a result of science, not aliens. ConclusionThe opponent has presented many arguments as to why the Earth is flat, but I have effectively rebutted all of them. Ultimately, he had no significant evidence actually showing his proposition to be believable, much less true. I have presented a wealth of evidence which was not refuted that clearly proves the Earth is round. Because this is true, it precludes the possibility of the Earth being flat. As such, one can only vote for Con this round. Thanks for reading. (1) - . http://dragon-komodo.com...;(2) - . https://shippingresearch.wordpress.com...;