I don't know why I have to keep explaining it. Take a basketball, set it on the floor, and place something on top. A coin. An action figure. A paper clip. I don't care. Just put it in on the basketball, tip the whole thing over, and observe. You'll soon find that whatever object you've placed on the ball will fall off of the ball as it rotates around the floor. This is because of gravity. So, if the object couldn't stay on the basketball because gravity would 'cause it to fall off off, how can there possibly be people living on the bottom of our basketball shaped Earth? All of those people should be falling off the Earth and into space. I don't need to prove it to you. You've already proven it yourself with our little experiment. Now, you can accept that the earth is indeed flat or you can choose to wallow in your own willful ignorance. The choice is yours.