Hi,
There is a YouTube video that suppose to show a scientific experiment with a helicopter that proves that the earth is not flat. The experiment shows that the helicopter is vanish when it goes under the horizon which is something that cannot occur on the flat earth:
https://www.youtube.com/watch?v=QVa2UmgdTM4
It looks very impressive, but someone in another YouTube channel noticed something very strange... in two different parts of this video you see the helicopter once when it is under the horizon, and once when its above it, but the frame and the background is exactly the s