You ever heard of a lunar eclipse? Also I don't believe everything I read on the internet. Anyway, a lunar eclipse is when the Earth blocks the moon. If the earth was flat, a small sliver of shadow would cover the moon.
Stay on the topic. Why don't basketballs roll away? Every black guy knows why, so if you can find one then just ask them. Most black men are flat earthers if you get to know them and it's mostly because they know about the basketball theory that proves flat earth.