* Flat Earth
I once saw a long thesis written by a flat-earther with contained a section that attempted to explain away all of the evidence for the planet being a sphere. One of the points insisted that there is no gravity, and that the earth is merely accelerating upwards at a rate equivalent to one g, which is why objects fall back to the planet. This is already hilarious for so many reasons, but then it went on to contradict itself by claiming that images taken from orbit only show a spherical earth because of gravitational lensing. So, basically, gravity only exists when it's convenient for reality-denial.
So what's the explanation for why anybody traveling around the world doesn't find an edge? Are there teleporters along the edges that instantaneously drop you back on the opposite edge before you find space?
Also, how does the atmosphere remain when there's no gravity?
How are items able to remain in orbit if there's no gravity to cause an orbit? If their theory was correct, any object that freed itself of atmospheric friction would either continue flying away from Earth or would come to a standstill above the atmosphere and find the Earth moving at 9.8 m/s^2 up toward them.
How does the moon stay in place with no orbit? Unless it's held up by strings, we should have been constantly flying toward it and slammed into it by now.