10 Reasons Why We Know the Earth is Round

It may seem juvenile, or even stupid, but how do we know the Earth is round? Not long ago, everyone thought the world was flat. Some even thought if you ventured too far, you could fall off. 

So how can we actually, and scientifically, prove that the Earth is round? Thankfully, Minute Physics has made this newest video with ten great reasons we know our world is round.