Flat Earth?
I've posted this twice before and no one has responded. I will try again. When a plane with contrails flies over your house at an altitude of 10 km, you can follow it for about 1 hour in good conditions until it reaches the horizon. In this hour the plane travels approximately 850 km. According to the Earth curve calculator, the plane should have disappeared 51 km below the horizon. Yet you can still see it... especially with binoculars. How is this possible? Do the experiment yourself!