We know the Earth is round, because we've been told it was round by scientists and we believe them. In case anyone still has any doubts, the folks at MinutePhysics have compiled a handy list of the top ten reasons we know the Earth is round. Some of them you can even test for yourself instead of just taking their word for it. Why not take some time out of your day to measure the curvature of the Earth for yourself? Is there really anyone left who thinks the Earth is flat?